Gemological Science International (GSI) is an independent gemological organization with a global footprint. GSI is the only major gemological laboratory established in the 21st century. We provide reliable gemstone identification and grading services, conduct gemological research to protect the industry and consumers, and offer a variety of educational programs to the trade and general public preparing a new generation of professionals. Since our founding in 2005 with one laboratory in New York

GSI: Offering Diamond & Jewelry Confidence Gemological laboratories are an essential part of the diamond industry. They provide the necessary certification and testing of diamonds and jewelry. Jewelry retailers rely on Gemological Science International (GSI) as an independent third party to ensure the jewelry they sell is accurately represented. This gives consumers of diamonds and jewelry confidence in their purchases. GSI offers a look inside its state-of-the-art laboratory, showing how diamon