Top GSI Info Guide: Gemstone Identification - Grading - Appraisal Services

GSI - Gemological Science International Certification

GSI is an independent gemological laboratory based in the heart of New York City's Diamond District with additional offices in diamond centers around the world.

GSI offers gemstone identification, grading and appraisal services exclusively to the fine jewelry industry.

The lab's business model is built on integrity, innovation, professional service and shared research education.

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Gemological Science International


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