In recent years, GSI has expanded its global footprint by opening offices in the United States, India, Israel, Belgium and Botswana.

From New York City to Antwerp and Mumbai, GSI works in close proximity to our clients in jewelry manufacturing, fabrication and distribution.

GSI provides reliable, fast, and professional gemstone identification as well as grading and appraisal services to the global fine jewelry industry.

Gemological Science International (GSI) is an independent gemological organization that provides gemstone identification & grading services, gemological research, and a broad range of educational programs to all levels of the diamonds, gemstone and jewelry trade.

A trusted and reliable partner to thousands of clients worldwide, GSI is wholly committed to the highest ethical standards and practices throughout all of its operations.

“Today, gem labs, with standardized grading systems and certifications for diamonds and other gems, help both retailers and consumers understand the true value of the stone.