About Us

Gemological Science International (GSI) is an independent commercial gemological laboratory. We combine state-of-the-art technology with deep professional expertise.

GSI provides reliable, fast, and professional gemstone identification as well as grading and appraisal services to the global fine jewelry industry. GSI is the only major gemological laboratory established in the 21st century. Within a relatively short period of time, GSI has grown to become one of the largest gem labs in the world.

In recent years, GSI has expanded its global footprint by opening offices in the United States, India, Israel, Belgium and Botswana. From New York City to Antwerp and Mumbai, GSI works in close proximity to our clients in jewelry manufacturing, fabrication and distribution. GSI’s goal is to make gem lab services as reliable and convenient as possible for leading companies in the gem and jewelry trade.

  • By combining innovative thinking, new technology, and traditional values, such as integrity and shared research, GSI has built a gem lab equipped to meet the evolving challenges of the industry.

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  • The Four Pillars of GSI’s operations are integrity, innovation, professional service, and shared research & education.

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  • GSI is proud to be affiliated with Jewelers of America, Jewelers Security Alliance, Jewelers Vigilance Committee, Diamond Dealers Club of New York City, Women’s Jewelry Association, World Diamond Council, and the Responsible Jewellery Council.

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  • The Gemological Science International management team is lead by Mark Gershburg, an industry veteran who has a quarter of a century experience in the gem lab industry. He has assembled a talented staff of executives, researchers, and consultants, many of whom are widely known and respected in the industry.

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