Gemological Science International (GSI) is the only major gemological organization established in the 21st century. Founded in 2005 in New York City, it has grown to become one of the largest gemological entities in the world with laboratory facilities spanning four continents. Utilizing cutting-edge processes and proprietary technologies, along with a commitment to the highest ethical standards and practices, GSI provides manufacturers and retailers globally with a wide range of gemstone identi

Gemological Science International (GSI) is one of the largest gemological organizations in the world. Utilizing leading-edge processes and proprietary technologies, GSI provides manufacturers and retailers globally with a wide range of gemstone identification and grading services. GSI is committed to advancing gemological research, offering educational programs for trade professionals and the general public at all levels. | Gemological Science International (GSI)

Learn to Use the Microscope (Video) - International Gem Society

Before You Buy, Insist on IGI. With IGI's diamond & jewelry grading reports you can SHOP WITH CONFIDENCE! #IGIconfident | International Gemological Institute - IGI

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