Alexandrite - Revision history

http://zissil.com/index.php?action=history&feed=atom&title=Alexandrite Alexandrite - Revision history 2026-06-09T13:34:01Z Revision history for this page on the wiki MediaWiki 1.17.0 http://zissil.com/index.php?title=Alexandrite&diff=10532&oldid=prev Marvinite at 16:13, 7 August 2013 2013-08-07T16:13:33Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 16:13, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''Alexandrite''' is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes. Their rarity makes them very valuable,  often more then than sapphire, ruby and emerald when weighing over 1 carat. Alexandrite were first discovered in 1834 in Ural Mountains of Russia and was named after future Russian Tsar Alexander II. These mines dried up after a few decades but new deposits were found in Minas Gerais, Brazil in 1987. Today alexandrites are mined in <del class="diffchange diffchange-inline">Alexandrite include </del>Russia, Brazil, Sri Lanka, Myanmar, Tanzania, Zimbabwe, Madagascar and India.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''Alexandrite''' is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes. Their rarity makes them very valuable,  often more then than sapphire, ruby and emerald when weighing over 1 carat. Alexandrite were first discovered in 1834 in Ural Mountains of Russia and was named after future Russian Tsar Alexander II. These mines dried up after a few decades but new deposits were found in Minas Gerais, Brazil in 1987. Today alexandrites are mined in Russia, Brazil, Sri Lanka, Myanmar, Tanzania, Zimbabwe, Madagascar and India.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10531&oldid=prev Marvinite at 16:12, 7 August 2013 2013-08-07T16:12:30Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 16:12, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''Alexandrite''' is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes. Their rarity makes them very valuable often more then than sapphire, ruby and emerald when weighing over 1 carat.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''Alexandrite''' is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes. Their rarity makes them very valuable<ins class="diffchange diffchange-inline">,  </ins>often more then than sapphire, ruby and emerald when weighing over 1 carat<ins class="diffchange diffchange-inline">. Alexandrite were first discovered in 1834 in Ural Mountains of Russia and was named after future Russian Tsar Alexander II. These mines dried up after a few decades but new deposits were found in Minas Gerais, Brazil in 1987. Today alexandrites are mined in Alexandrite include Russia, Brazil, Sri Lanka, Myanmar, Tanzania, Zimbabwe, Madagascar and India</ins>.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 58:</td> <td colspan="2" class="diff-lineno">Line 58:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Sources==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Sources==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Current sources of Alexandrite include Russia, Brazil, Sri Lanka, Myanmar, Tanzania, Zimbabwe, Madagascar and India</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Current sources of Alexandrite include Russia, Brazil, Sri Lanka, Myanmar, Tanzania, Zimbabwe, Madagascar and India<ins class="diffchange diffchange-inline">.</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Russia===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Russia===</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10530&oldid=prev Marvinite at 16:05, 7 August 2013 2013-08-07T16:05:18Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 16:05, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''Alexandrite''' is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''Alexandrite''' is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes<ins class="diffchange diffchange-inline">. Their rarity makes them very valuable often more then than sapphire, ruby and emerald when weighing over 1 carat</ins>.  </div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10529&oldid=prev Marvinite at 16:00, 7 August 2013 2013-08-07T16:00:55Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 16:00, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''Alexandrite'''</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''Alexandrite''' <ins class="diffchange diffchange-inline">is a variety of color change chrysoberyl. When viewed in daylight or fluorescent light alexandrites are green, turning red when viewed in incandescent light. Its strong color change properties, termed the 'alexandrite effect' result from minor chromium or vanadium impurities that replace aluminum in the crystal structure. Alexandrite are also strongly pleochroic and occasionally exhibit chatoyancy, in which-case they are cabbed into cat's eyes. </ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Phenomenon==</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10528&oldid=prev Marvinite at 15:52, 7 August 2013 2013-08-07T15:52:58Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:52, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 78:</td> <td colspan="2" class="diff-lineno">Line 78:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Buyers Guide==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Buyers Guide==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Distinct color change is the important factor when purchasing an alexandrite, although color saturation and clarity also effect its price. Top quality alexandrites show a strong color change from purplish red in incandescent light to bluish green in daylight, without any trace of brown or gray and have moderately strong to strong color saturation. Such stones command heavy prices so any inexpensive gems with these colors is likely a synthetic or simulant. For a significant purchase, a certification of gem identity and natural vs. synthetic is recommended.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Distinct color change is the <ins class="diffchange diffchange-inline">most </ins>important factor when purchasing an alexandrite, although color saturation and clarity also effect its price. Top quality alexandrites show a strong color change from purplish red in incandescent light to bluish green in daylight, without any trace of brown or gray and have moderately strong to strong color saturation. Such stones command heavy prices<ins class="diffchange diffchange-inline">, </ins>so any inexpensive gems with these colors is likely a synthetic or simulant. For a significant purchase, a certification of gem identity and natural vs. synthetic is recommended.  </div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>==Price and Availability==</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">=</ins>==Price and Availability<ins class="diffchange diffchange-inline">=</ins>==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Due to its rarity, alexandrites are expensive gems and fine quality specimens are considered more valuable than sapphire, ruby and emerald, especially when weighing over 1 carat. Large alexandrites especially those originating in Russia are hardly ever found in modern jewelry and <del class="diffchange diffchange-inline">is </del>only likely to be found in antique - estate jewelry which can be found listed at auctions with impressive estimates. Most cut alexandrite on the market today<del class="diffchange diffchange-inline">, </del>weighs less than one carat and has low saturation muddied coloring. Cat's eye alexandrite is particularly valuable. Quality alexandrite is generally attained through specialized dealers. Improved trade with Russia have released a better supply of these gems <del class="diffchange diffchange-inline">to </del>the market.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Due to its rarity, alexandrites are expensive gems and fine quality specimens are considered more valuable than sapphire, ruby and emerald, especially when weighing over 1 carat. Large alexandrites especially those originating in Russia are hardly ever found in modern jewelry and <ins class="diffchange diffchange-inline">are </ins>only likely to be found in antique - estate jewelry which can be found listed at auctions with impressive estimates. Most cut alexandrite on the market today weighs less than one carat and has low saturation muddied coloring. Cat's eye alexandrite is particularly valuable. Quality alexandrite is generally attained through specialized dealers. Improved trade with Russia have released a better supply of these gems <ins class="diffchange diffchange-inline">into </ins>the market.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Certification===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Certification===</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>GIA offers identification reports for loose or mounted <del class="diffchange diffchange-inline">Alexandrite </del>but no grading as is their policy with all other gemstones. Their cert also states whether the alexandrite is natural or synthetic, and lists any detectable treatments as well as providing the weight, measurements, shape, cutting style and color of the stone. GIA does not offer certification of origin for alexandrites.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>GIA offers identification reports for loose or mounted <ins class="diffchange diffchange-inline">alexandrite, </ins>but no grading as is their policy with all other gemstones. Their cert also states whether the alexandrite is natural or synthetic, and lists any detectable treatments<ins class="diffchange diffchange-inline">, </ins>as well as providing the weight, measurements, shape, cutting style and color of the stone. GIA does not offer certification of origin for alexandrites.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Alternatives===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Alternatives===</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10527&oldid=prev Marvinite at 15:45, 7 August 2013 2013-08-07T15:45:59Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:45, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 49:</td> <td colspan="2" class="diff-lineno">Line 49:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Alexandrite Identification==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Alexandrite Identification==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>An Alexandrite can easily be separated from most stones through its color change properties. A simple flicker between fluorescent and incandescent light sources does the job. This leaves only color change garnets, synthetic color change sapphire, and synthetic color change spinel. After a stone has been identified as an Alexandrite it still has to be determined if it is a synthetic or natural.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>An Alexandrite can easily be separated from most stones through its color change properties. A simple flicker between fluorescent and incandescent light sources does the job. This leaves only color change garnets, synthetic color change sapphire, and synthetic color change spinel. After a stone has been identified as an Alexandrite it still has to be determined if it is a synthetic or natural<ins class="diffchange diffchange-inline">, this is done though high magnification of the stone's inclusions</ins>.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==History==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==History==</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 61:</td> <td colspan="2" class="diff-lineno">Line 61:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Russia===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Russia===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Original </del>source of the Alexandrite. <del class="diffchange diffchange-inline">Gemstones </del>are very high quality with distinct color changes and saturated colors. These mines produced many of the larger Alexandrites on the market weighing 5 carats or more. Mines have since dried out but still continue producing alexandrite in low volume.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Russia was the original </ins>source of the Alexandrite. <ins class="diffchange diffchange-inline">Its gemstones </ins>are very high quality with distinct color changes and saturated colors. These mines produced many of the larger Alexandrites on the market weighing 5 carats or more. Mines have since dried out but still continue producing alexandrite in low volume.  </div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Brazil===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Brazil===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Also produced </del>large specimens of 5 carats and up. Hematita is still one of the most important deposits of alexandrite, although production has decreased in <del class="diffchange diffchange-inline">resent </del>years. Its stones show a nice color change from bluish green to raspberry red. Occasionally stones with chatoyancy are discovered in Brazil, mainly around the Americana and Santana valleys, and are cut as cabochon cat's eyes.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Brazil also produces </ins>large specimens of 5 carats and up. Hematita is still one of the most important deposits of alexandrite, although production has decreased in <ins class="diffchange diffchange-inline">recent </ins>years. Its stones show a nice color change from bluish green to raspberry red. Occasionally stones with chatoyancy are discovered in Brazil, mainly around the Americana and Santana valleys, and are cut as cabochon cat's eyes.  </div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Sri Lanka===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Sri Lanka===</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10526&oldid=prev Marvinite at 15:37, 7 August 2013 2013-08-07T15:37:07Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:37, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 16:</td> <td colspan="2" class="diff-lineno">Line 16:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Color===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Color===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Shades and hues of <del class="diffchange diffchange-inline">the Alexandrite </del>vary widely and are often influenced by their mining origin. Alexandrites most treasured colors are green by daylight and red by incandescent light, with pure hues that display a strong color change, as was prevalent in many of the gemstones originating from the initial Russian find. Brazilian alexandrite is known to be highly saturated and display a bluish green to purplish red color change. Alexandrite originating in Zimbabwe often <del class="diffchange diffchange-inline">have very little </del>color change and are typically darker in color with tints of purple. Sir Lanka alexandrites have a muddy appearance and exhibit a khaki to brown color change. Specimens from Tanzanian tend to have lighter tones and possess decent color change. Other varieties of alexandrite can appear yellowish or pink in daylight and turn raspberry red by incandescent light. As a general rule; Alexandrites that are too light lack the intensity found in high quality gems. Stones that are too dark lack brightness and can appear almost black.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Shades and hues of <ins class="diffchange diffchange-inline">alexandrites </ins>vary widely and are often influenced by their mining origin. Alexandrites most treasured colors are green by daylight and red by incandescent light, with pure hues that display a strong color change, as was prevalent in many of the gemstones originating from the initial Russian find. Brazilian alexandrite is known to be highly saturated and display a bluish green to purplish red color change. Alexandrite originating in Zimbabwe often <ins class="diffchange diffchange-inline">display a weak </ins>color change and are typically darker in color with tints of purple. Sir Lanka alexandrites have a muddy appearance and exhibit a khaki to brown color change. Specimens from Tanzanian tend to have lighter tones and possess decent color change. Other varieties of alexandrite can appear yellowish or pink in daylight and turn raspberry red by incandescent light. As a general rule; Alexandrites that are too light<ins class="diffchange diffchange-inline">, </ins>lack the intensity found in high quality gems. Stones that are too dark<ins class="diffchange diffchange-inline">, </ins>lack brightness and can appear almost black.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Sizes===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Sizes===</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 25:</td> <td colspan="2" class="diff-lineno">Line 25:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Clarity and Luster===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Clarity and Luster===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Alexandrite rough ranges from transparent to opaque. It is type II gemstone, and can be expected to show some inclusions to the unaided eye that <del class="diffchange diffchange-inline">don't </del>detract much from its beauty, although many cut stones are clean. Once cut and polished, alexandrites exhibit a vitreous luster.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Alexandrite rough ranges from transparent to opaque. It is type II gemstone, and can be expected to show some inclusions to the unaided eye that <ins class="diffchange diffchange-inline">do not </ins>detract much from its beauty, although many cut stones are clean. Once cut and polished, alexandrites exhibit a vitreous luster.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Varieties===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Varieties===</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 40:</td> <td colspan="2" class="diff-lineno">Line 40:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Usage in Jewelry===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Usage in Jewelry===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Alexandrites are hard and durable making them ideal for any jewelry design <del class="diffchange diffchange-inline">such as </del>earrings, rings, brooches, pendants, pins and pendants. Many English Victorian designs contain alexandrites, generally smaller stones. Alexandrites  are often found as accent stones since they are small and expensive. Original alexandrites from Russia's Ural Mountains are typically center stones and are often found in estate jewelry. It is difficult to find matching alexandrites for earrings, <del class="diffchange diffchange-inline">three </del>stone rings and necklaces that share the same shape, color, size and color change.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Alexandrites are hard and durable making them ideal for any jewelry design <ins class="diffchange diffchange-inline">including </ins>earrings, rings, brooches, pendants, pins and pendants. Many English Victorian designs contain alexandrites, generally smaller stones. Alexandrites  are often found as accent stones since they are small and expensive. Original alexandrites from Russia's Ural Mountains are typically center stones and are often found in estate jewelry. It is difficult to find matching alexandrites for earrings, <ins class="diffchange diffchange-inline">multi </ins>stone rings and necklaces that share the same shape, color, size and color change.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Synthetics===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Synthetics===</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10525&oldid=prev Marvinite at 15:27, 7 August 2013 2013-08-07T15:27:45Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:27, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 8:</td> <td colspan="2" class="diff-lineno">Line 8:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Pleochroism===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Pleochroism===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Aside from its unique color changing abilities, Alexandrites are a strongly pleochroic gem, displaying different colors when viewed from different directions. Depending on the angle viewed, alexandrites can display various shades of orange, red, yellow and green. Its pleochroic properties are completely independent from the 'alexandrite effect'. Typically the three pleochroic colors seen in an Alexandrite are are orange, green and purple-red.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Aside from its unique color changing abilities, Alexandrites are a strongly pleochroic gem, displaying different colors when viewed from different directions. Depending on the angle viewed, alexandrites can display various shades of orange, red, yellow and green. Its pleochroic properties are completely independent from the 'alexandrite effect'. Typically<ins class="diffchange diffchange-inline">, </ins>the three pleochroic colors seen in an Alexandrite are are orange, green and purple-red.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Cat's Eye===  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Cat's Eye===  </div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Extremely rare specimens of Alexandrite contain long, thin inclusions that are aligned parallel to each other, causing it to exhibit chatoyancy (cat's eye effect) when the stone is cut into a cabochon. Cat’s-eye alexandrite generally originates in Brazil and is more valuable then <del class="diffchange diffchange-inline">its standard form</del>.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Extremely rare specimens of Alexandrite contain long, thin inclusions that are aligned parallel to each other, causing it to exhibit chatoyancy (cat's eye effect) when the stone is cut into a cabochon. Cat’s-eye alexandrite generally originates in Brazil and is more valuable then <ins class="diffchange diffchange-inline">regular faceted stones</ins>.  </div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Details==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Details==</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10524&oldid=prev Marvinite at 15:24, 7 August 2013 2013-08-07T15:24:59Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:24, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 5:</td> <td colspan="2" class="diff-lineno">Line 5:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Color Change===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Color Change===</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Only chrysoberyl that contain <del class="diffchange diffchange-inline">distinctly </del>change colors can officially be called an alexandrite in the jewelry industry. When viewed <del class="diffchange diffchange-inline">in </del>in natural daylight or fluorescent light these gemstones appear green. When viewed in incandescent light or <del class="diffchange diffchange-inline">a </del>candle flame they appear red. So striking is the transformation by the Alexandrite <del class="diffchange diffchange-inline">above </del>other color <del class="diffchange diffchange-inline">changing </del>gemstones, that this phenomenon is referred to as the 'alexandrite effect' in the world of [[Gemology|gemology]]. Alexandrites are pleochroic gemstones but their color change properties are totally independent of this, instead resulting from <del class="diffchange diffchange-inline">their </del>unusual light-absorbing properties that cause a strong absorption of light in the blue and yellow portions of the color spectrum. Color change in Alexandrites are caused by minor traces of chromium ions that replace aluminum in the crystal structure. Occasionally vanadium also takes part in the process. Some alexandrite owner enjoy flicking the gem's colors back and forth by rotating it between fluorescent and incandescent light sources.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Only chrysoberyl that contain <ins class="diffchange diffchange-inline">distinct </ins>change colors can officially be called an alexandrite in the jewelry industry. When viewed in natural daylight or fluorescent light these gemstones appear green. When viewed in incandescent light or <ins class="diffchange diffchange-inline">by </ins>candle flame they appear red. So striking is the transformation by the Alexandrite <ins class="diffchange diffchange-inline">in comparison to </ins>other color <ins class="diffchange diffchange-inline">change </ins>gemstones, that this phenomenon is referred to as the 'alexandrite effect' in the world of [[Gemology|gemology]]. Alexandrites are pleochroic gemstones but their color change properties are totally independent of this, instead resulting from unusual light-absorbing properties that cause a strong absorption of light in the blue and yellow portions of the color spectrum. Color change in Alexandrites are caused by minor traces of chromium ions that replace aluminum in the crystal structure. Occasionally vanadium also takes part in the process. Some alexandrite owner enjoy flicking the gem's colors back and forth by rotating it between fluorescent and incandescent light sources.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Pleochroism===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Pleochroism===</div></td></tr> </table>

Marvinite http://zissil.com/index.php?title=Alexandrite&diff=10523&oldid=prev Marvinite: /* Buyers Guide */ 2013-08-07T15:20:25Z

<p><span class="autocomment">Buyers Guide</span></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:20, 7 August 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 79:</td> <td colspan="2" class="diff-lineno">Line 79:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Buyers Guide==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Buyers Guide==</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Distinct color change is the important factor when purchasing an alexandrite, although color saturation and clarity also effect its price. Top quality alexandrites show a strong color change from purplish red in incandescent light to bluish green in daylight, without any trace of brown or gray and have moderately strong to strong color saturation. Such stones command heavy prices so any inexpensive gems with these colors is likely a synthetic or simulant. For a significant purchase, a certification of gem identity and natural vs. synthetic is recommended.  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Distinct color change is the important factor when purchasing an alexandrite, although color saturation and clarity also effect its price. Top quality alexandrites show a strong color change from purplish red in incandescent light to bluish green in daylight, without any trace of brown or gray and have moderately strong to strong color saturation. Such stones command heavy prices so any inexpensive gems with these colors is likely a synthetic or simulant. For a significant purchase, a certification of gem identity and natural vs. synthetic is recommended.  </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">==Price and Availability==</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Due to its rarity, alexandrites are expensive gems and fine quality specimens are considered more valuable than sapphire, ruby and emerald, especially when weighing over 1 carat. Large alexandrites especially those originating in Russia are hardly ever found in modern jewelry and is only likely to be found in antique - estate jewelry which can be found listed at auctions with impressive estimates. Most cut alexandrite on the market today, weighs less than one carat and has low saturation muddied coloring. Cat's eye alexandrite is particularly valuable. Quality alexandrite is generally attained through specialized dealers. Improved trade with Russia have released a better supply of these gems to the market.</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Certification===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Certification===</div></td></tr> </table>

Marvinite