Our mission is to make gemology accessible and affordable
Established in 1998, IGS is the largest online gemology resource and community.
Who are IGS members?
A society is about people that are interconnected. Here at IGS, our passion for gemstones brings us together. IGS has members on every continent (except Antarctica) who range from seasoned professionals to the merely curious.
Aspiring Professionals
Accelerate your path towards a professional gemology career
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Curious Enthusiasts
Learn key knowledge and skills to further pursue your passion
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Lapidaries & Metalsmiths
Deepen your skillset for working with gemstones in jewelry
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Collectors & Private Dealers
Price and quality guidance on over 70 types of gemstones
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What people are saying
The IGS Team
The management and advisory team at IGS is a diverse group of professionals committed to delivering our mission.
Lisa Rosen
Company Management
In 2012, Donald Clark retired and passed along stewardship of the IGS to the Rosen family, who were longtime members of the IGS. Lisa Rosen runs the day-to-day operation of IGS and The Ganoksin Project, a technical resource website for bench jewelers and jewelry manufacturers. Lisa strongly believes that IGS...
Meet Lisa Rosen
Donald Clark, CSM IMG
Founder
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 "CSM" after his name stood for Certified Supreme...
Meet Donald Clark, CSM IMG
Jeffery Bergman, SSEF SGC
Vice President Emeritus
Jeffery Bergman, SSEF SGC, founder and director of 8th Dimension Gems in Thailand, is an American gem dealer with more than 40 years of experience in gemstone and fine jewelry mining, cutting, wholesaling and retailing. His career has taken him to more than 50 countries and every continent except Antarctica....
Meet Jeffery Bergman, SSEF SGC
Joel E. Arem, Ph.D., FGA
Contributor
Dr. Joel E. Arem has more than 60 years of experience in the world of gems and minerals. After obtaining his Ph.D. in Mineralogy from Harvard University, he has published numerous books that are still among the most widely used references and guidebooks on crystals, gems and minerals in the...
Meet Joel E. Arem, Ph.D., FGA
Fatma Oya Borahan, GG, FGG
Contributor
Fatma Oya Borahan, GG, FGG has Graduate Gemologist and Diamond Diplomas from the Gemological Institute of America (GIA) the German Gemmological Association (DGemG) and Gemmological Association of Great Britain (GemA). birdamlasu.com
Meet Fatma Oya Borahan, GG, FGG
Barbara Smigel, PhD. GG
Contributor
Barbara Smigel is a GIA Graduate Gemologist, faceter, jewelry designer, gem dealer, gemology instructor and creator of the well-regarded educational websites acstones.com and bwsmigel.info.
Meet Barbara Smigel, PhD. GG
Dr. Gerald Wykoff GG CSM
Contributor
Dr. Gerald Wykoff is GG (Graduate Gemologist), a CSM (Certified Supreme Master gemcutter), educator, and author of several gemology books. He founded the American Society of Gemcutters in the 1980s and served for more than 10 years as the editor of its monthly magazine, American Gemcutter.
Meet Dr. Gerald Wykoff GG CSM
Addison Rice
Staff Writer
A geologist, environmental engineer and Caltech graduate, Addison's interest in the mesmerizing and beautiful results of earth's geological processes began in her elementary school's environmental club. When she isn't writing about gems and minerals, Addison spends winters studying ancient climates in Iceland and summers hiking the Colorado Rockies.
Meet Addison Rice
Jeff R. Graham
Contributor
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 Gram Faceting Designs.
Meet Jeff R. Graham
Kyrylo Gubariev, Graduate Gemologist (GG, AJP)
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.
Meet Kyrylo Gubariev, Graduate Gemologist (GG, AJP)
Jim Buday, Lapidarist
Jim Buday was born and raised in Wisconsin. He founded the Reddit thread, Shinypreciousgems, which now sits at more than 25,000 members. Recently, Jim started creating his own gem designs.
Meet Jim Buday, Lapidarist
Never Stop Learning
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