Gemological Science International

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Gemological Science International (GSI) is an independent gemological laboratory that provides professional gemstone identification, grading and appraisal services to the fine jewelry industry. It was founded by Mark Gershburg, former CEO of EGL USA and member of World Diamond Council (WDC), in March, 2005. GSI’s management team collectively offers over three decades of experience in the gem laboratory industry. GSI are located in the heart of New York City's Diamond District.

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