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Gemological Science International is an independent gemological laboratory that provides professional gemstone identification, grading and appraisal services to the fine jewelry industry. It was established by its parent company, Gem Experience, LLC, in March 2005. GSI’s management team collectively offers over three decades of experience in the gem laboratory industry.

GSI and Gem Experience, LLC, are located in the heart of New York City's Diamond District. See Contact Us for details.

GSI has re-engineered the processing paths for gem I.D. and grading, which has resulted in higher levels of productivity and reduced costs. These cost efficiencies are passed on to our customers and ultimately to consumers. This means that more consumers can afford the benefits of having a grading report for their gemstones, including low-cost items.

GSI’s Vision
To create an innovative, technologically advanced gemological laboratory to meet the changing needs of consumers and the diamond jewelry industry.

These changes include, among others:

  • Consumers desire to know more about what they are purchasing.
  • Increase in diamond and other jewelry sales to a broad market.
  • Extraordinary growth of Internet jewelry sales and an increase in other outlets where diamonds and jewelry are bought  "sight unseen," such as cable TV and mail order.

Consumers who want a GSI report should request one from their local jeweler. In addition to grading reports, the following two programs are available directly to consumers:

Click here for information on what distinguishes us from other professional gem labs.


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