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Gemological Science International, or GSI, is an independent gemological organization that is one of the largest gemological entities in the world, with offices spanning four continents.

Founded in New York City in 2005, by Mark Gershburg and Debbie Azar, GSI's laboratory division provides diamond and gemstone grading and identification services as well as gemological research, and a variety of educational programs for gemological professionals. GSI also acts as a resource of gem and jewelry information for trade press, global media organizations and the general public.

Global Footprint
GSI’s worldwide headquarters is located in the heart of New York City’s Diamond District. GSI has offices and laboratories in India (Mumbai, Surat and Thrissur); the Middle East (Ramat Gan); Dubai; Belgium (Antwerp); and Botswana (Gaborone).

Gemological Laboratory Services
The only major gem lab established in the 21st century, GSI Gemological Laboratory performs services from basic grading to the most sophisticated testing and examination using advanced instruments.

The lab offers sorting of melee, cut grade analysis, light analysis reports, loose and mounted diamonds' grading, gemstones' identification, origin testing of loose diamonds and gemstones, treatment identification, laser inscription on diamonds and gemstones, metal engraving, jewelry QC, metal inspection, and 360-degree virtual imaging on every loose diamond. GSI became the first gem lab to implement leading edge technologies to test all loose diamonds and gemstones for their origin. GSI became the first gem lab to implement leading edge technologies to test all loose diamonds and gemstones for their origin.

GSI offers different types of grading and identification, printed with differing formats, details, and prices. Each report includes educational materials to help consumers understand the information in the context of personal jewelry and diamond purchases.

GSI Research Center
GSI's Research Center shares research findings with others in the trade. The Research Center works closely with leading manufacturers of high-tech equipment to integrate GSI’s knowledge of gem laboratory requirements with those manufacturers’ expertise in hardware, software, magnification, optics, lighting and other fields. Through its efforts, GSI has pioneered important breakthroughs in identifying man-made and treated diamonds.

Social Responsibility
GSI participates in a myriad of trade organizations including the Jewelers Security Alliance, Jewelers Vigilance Committee, Responsible Jewellery Council (RJC), Dubai Multi Commodities Centre (DMCC), International Diamond Exchange (IDE), Jewelers for Children (JFC), Women’s Jewelry Association, Bharat Diamond Bourse, Antwerp Diamond Club and more. GSI helps to increase exposure for leading jewelry designers by sponsoring showcase events of their work.