Black opal, 16.42 cts, from Lightning Ridge, Australia. Photo by Daniel Mekis. Licensed under CC By-SA 3.0.

Black Opal | Black | 16.42 ct - International Gem Society

Black Opal id-m-435719 - International Gem Society

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Black Opal | Black | 16.42 ct

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Black Opal

Opal Stone

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Black <a href="https://www.gemsociety.org/article/opal-jewelry-and-gemstone-information/" data-wpel-link="internal">opal</a>, 16.42 cts, from Lightning Ridge, Australia. <a href="https://commons.wikimedia.org/wiki/File:16.42cts_Lightning_Ridge_black_Opal.JPG" data-wpel-link="external" target="_blank" rel="external nofollow">Photo</a> by <a href="https://www.redcarpetopals.com" data-wpel-link="external" target="_blank" rel="external nofollow">Daniel Mekis</a>. Licensed under <a href="https://creativecommons.org/licenses/by-sa/3.0/legalcode" data-wpel-link="external" target="_blank" rel="external nofollow">CC By-SA 3.0</a>.

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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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The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as <a href="https://rockpeddler.com/product-category/instructional-materials/">Gram Faceting Designs</a>.

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Bear Williams, CG, FGA (Hon), is President and Laboratory Director at <a href="https://stonegrouplabs.com/">Stone Group Laboratories</a>. Bear travels to gem producing countries and treating regions researching the latest trends in gemology and visiting with other lab directors. On-site research allows him to keep abreast of new synthetics and treatments in the marketplace. He regularly meets with other gemological associations and labs, and together will present research findings, and discuss the latest nomenclature or laboratory issues relevant to the trade and consumers. Recognized as an expert in the field of digital spectroscopy, Bear operates UV-Vis-NIR, ED-XRF, FTIR, UV, and Raman Spectrometers.

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Cara Williams, FGA, is Vice-President and Senior Staff Gemologist at <a href="https://stonegrouplabs.com/">Stone Group Laboratories</a>. Cara is a fellow of the Gemmological Association of Great Britain (Gem-A). She has been a tutor for the prestigious Diploma in Gemmology course for the Gem-A in London for more than 15 years. Growing up in a retail jewelry family with a concentration in colored stones, Cara has been in the wholesale trade since 1986. She brings a lifetime of experience working with gems to the lab, her students, and many published articles.

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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.

Gemstone	Black Opal, Opal Stone, Precious Opal
Natural or man made	Natural
Origin	Australia
Origin details	Lightning Ridge
Carat Weight	16.42
Gem State	Cabochon
Color	Black
Transparency	Opaque
Photo phenomena	Play of Color