Many people ask, how does a comparison of GSI vs. GIA grading look? What is the difference between GSI vs. GIA certificates? What is the difference between a GSI vs. GIA certified stone?

If these are your questions, this age can help to answer them.



Gemological Science International (GSI) is an independent commercial gemological laboratory. We combine state-of-the-art technology with deep professional expertise.

GSI provides reliable, fast, and professional gemstone identification as well as grading and appraisal services to the global fine jewelry industry. GSI is the only major gemological laboratory established in the 21st century. Within a relatively short period of time, GSI has grown to become one of the largest gem labs in the world.

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’s goal is to make gem lab services as reliable and convenient as possible for leading companies in the gem and jewelry trade.

Established in 1931, GIA grades on diamonds, colored stones, and pearls. You can learn more here.


GSI offers several grading reports to meet client needs for different levels of format, detail and price.  Each report includes educational materials to help consumers understand the information in the context of personal jewelry and diamond purchases. You can read more about GSI grading here.

GIA offers several grading reports as well – more information on GIA grading may be found here.