Seth and Lisa Rosen

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 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 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.

Articles by Lisa Rosen

A Guide To The Best Radiant Cut Diamond Rings

A Guide To The Best Radiant Cut Diamond Rings

Radiant cut diamond rings combine the best traits of the round and princess cut diamonds, but are 20-40% cheaper than...
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VRAI Review: The Best Climate-Friendly Jeweler for Lab Grown DiamondsVRAI" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" decoding="async" data-nimg="responsive" style="position:absolute;top:0;left:0;bottom:0;right:0;box-sizing:border-box;padding:0;border:none;margin:auto;display:block;width:0;height:0;min-width:100%;max-width:100%;min-height:100%;max-height:100%;object-fit:cover;object-position:50% 50%"/>

VRAI Review: The Best Climate-Friendly Jeweler for Lab Grown Diamonds

Lab grown diamonds are fundamentally changing the diamond industry. Consumers have discovered they can get a larger, nicer diamond that...
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Exclusive: IGS Reveals the Most Popular Gemstone by State for 2023

Exclusive: IGS Reveals the Most Popular Gemstone by State for 2023

Join us as we unveil the most coveted gemstones that have captured the hearts of residents in every corner of...
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How To Buy A Heart Cut Diamond Ring0.50-carat heart shaped halo on a twisted band</a> is surrounded by diamonds for endless sparkle. © Blue Nile" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" decoding="async" data-nimg="responsive" style="position:absolute;top:0;left:0;bottom:0;right:0;box-sizing:border-box;padding:0;border:none;margin:auto;display:block;width:0;height:0;min-width:100%;max-width:100%;min-height:100%;max-height:100%;object-fit:cover;object-position:50% 50%"/>

How To Buy A Heart Cut Diamond Ring

Heart cut diamond rings are becoming more popular as engagement ring stones. Learn about quality, clarity, color and cost.
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How to Buy A Two Carat Diamond Ringknife-edge band</a> and 14K white gold. © Blue Nile" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" decoding="async" data-nimg="responsive" style="position:absolute;top:0;left:0;bottom:0;right:0;box-sizing:border-box;padding:0;border:none;margin:auto;display:block;width:0;height:0;min-width:100%;max-width:100%;min-height:100%;max-height:100%;object-fit:cover;object-position:50% 50%"/>

How to Buy A Two Carat Diamond Ring

A 2 carat diamond ring is larger than the average 1-1.5 carat diamond ring. It is critical to understand the...
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More Team Members
Donald Clark, CSM
Donald Clark, CSM IMG
Jeffery Bergman, SSEF SGC
Joel E. Arem, Ph.D., FGA
Fatma Oya Borahan, GG, FGG
Barbara Smigel, PhD. GG
View the whole team