Opal triplets, 2.70 carats each. Note how these assembled gems have a noticeably glass-like sheen. Also, their color remains on the bottom and doesn’t float towards the top of the stone. © Opal Auctions. Used with permission.

Opal Stone - Assembled, Cabochon, White - International Gem Society

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Opal Stone – Assembled, Cabochon, White

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Opal Stone

<a href="https://www.gemsociety.org/article/opal-jewelry-and-gemstone-information/" data-wpel-link="internal">Opal</a> triplets, 2.70 carats each. Note how these assembled gems have a noticeably glass-like sheen. Also, their color remains on the bottom and doesn't float towards the top of the stone. © <a href="https://www.opalauctions.com/auctions/triplet-opal-parcel-australian-270-cts-lo-3385-566102" data-wpel-link="external" target="_blank" rel="external noopener nofollow">Opal Auctions</a>. Used with permission.

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In 2012, Donald Clark retired and passed along stewardship of the IGS to the Rosen family, who were longtime members of IGS. Lisa Rosen runs the day-to-day operation of IGS and  <a href="https://www.ganoksin.com/">The Ganoksin Project, a technical resource website for bench jewelers and jewelry manufacturers</a>.  Lisa strongly believes that IGS must remain a cost-effective, accurate, and comprehensive resource for all those interested in gemology. IGS is our passion, and it is a family business.

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The late Donald Clark, CSM founded the International Gem Society in 1998. Donald started in the gem and jewelry industry in 1976. He received his formal gemology training from the Gemological Institute of America (GIA) and the American Society of Gemcutters (ASG). The letters &#8220;CSM&#8221; after his name stood for Certified Supreme Master Gemcutter, a designation of Wykoff&#8217;s ASG which has often been referred to as the doctorate of gem cutting. The American Society of Gemcutters only had 54 people reach this level. Along with dozens of articles for leading trade magazines, Donald authored the book &#8220;Modern Faceting, the Easy Way.&#8221;

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Jeffery Bergman, SSEF SGC

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Kyrylo Gubariev, Graduate Gemologist (GG, AJP) is a gemologist with a passion for sharing his knowledge with fellow gem lovers. Originally from Ukraine, he is currently based in Bangkok, Thailand.

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Gemstone	Opal Stone
Natural or man made	Assembled
Gem State	Cabochon
Color	White
Transparency	Translucent
Photo phenomena	Play of Color