Gemological Science International (GSI) one of the world largest gemological organizations participates in the 2nd edition of DDES (Diamond Detection Expo & Symposium) a two-day event which aims to provide a platform for companies offering machines, expertise& equipment for the detection of synthetic diamonds.
Gemological Science International (GSI) laboratory department was the first to bring innovating methods of the batch-testing for star and melee- sized diamonds to Surat.
GSI in the past has taken active steps to impart industry knowledge on detection of synthetic diamonds by conducting seminars led by its expert research and development team.
At this premium industry platform GSI is proud to announce that its services in Surat office moved to its new bigger facility at and is offering grading, testing and detection services like diamond jewelry random origin testing, comprehensive origin testing, jewelry screening, loose diamond testing, loose diamond screening, melee and star batch origin testing and screening, diamond jewelry treatment testing and its unique MobiLab service for on-site diamond origin screening and diamond jewelry screening.
Gemological Science International (GSI) is the only major gemological body established in the 21st century. Founded in 2005 in New York City, it provides reliable gemstone identification and grading services, is engaged in gemological research, and also offers a variety of educational programs to help prepare the new generation of professional graders.
GSI is proud to offer gemological services that are reliable, efficient, and convenient on a global scale by working in close proximity to our clients. Therefore, it has grown to become one of the largest gemological entities in the world with offices spanning four continents
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Corporate Communications Manager
💎 Where is Gemological Science International (GSI) located?
GSI is headquartered in New York, NY. It has 13 laboratories on four continents and in a number of countries: the United States, India, Dubai, Israel, Belgium, Hong Kong, and Botswana. This makes GSI one of the largest independent gemological organizations in the world.
💎 Is there a difference between grading reports issued by different GSI laboratories?
All GSI laboratories grade using the same methods and adhere to the same standards. Every laboratory is staffed with highly trained professionals who have years of grading experience and an extensive gemological background.
💎 What does it mean when a sales associate tells me my diamond is “GSI Certified” or is accompanied by a “GSI Certificate”?
The phrases “GSI Certificate” and “GSI Certified” are industry shorthand for GSI grading or identification reports. What this means to you is that expert gemologists and trained professionals meticulously evaluated the item. When your diamond, jewelry or gemstone is accompanied by a GSI grading report, you can be completely confident in the accuracy and objectivity of the evaluation.
💎 Where can I find “GSI Certified Diamonds”?
GSI diamond grading and identification reports can be found in jewelry stores worldwide and online. Insist on a GSI grading report when shopping for a diamond, jewelry or gemstone.
💎 What do I do if I lose my GSI Diamond Report?
💎 What are the 4Cs
A beautiful diamond is one of nature’s most mesmerizing creations. But how do you objectively judge the quality of the gem? The 4Cs – Cut, Color, Clarity, and Carat Weight – are the universal standard for doing this.
💎 Is there anything beyond the 4Cs?
The 4Cs are an essential and important description of a diamond’s characteristics. But there is a considerable amount of detailed information behind each “C” along with other qualities of a diamond that affect its beauty, such as fluorescence, light performance and more.
How much do you need to know? That’s up to you, but knowing the 4Cs is almost essential.
💎 What does a GSI diamond grading report look like?
GSI offers a number of grading reports (often referred to as “GSI Certificates”). You can see samples of them by browsing the Grading Reports page on our website.
💎 What does a GSI colored diamond grading report look like?
You can see samples grading reports by browsing the Grading Reports page on our website.
💎 What does a GSI Colored stone report look like?
You can see samples of Colored stones reports by browsing Grading Reports page on our website.
💎 How does a GSI grading report compare to other laboratories that issue grading reports?
It is our policy not to comment on other laboratories. However, know that GSI adheres to the highest ethical standards. We do this in a number of ways:
- Rotating gemologists to our different labs
- Continuously upgrading our proprietary grading software to ensure full compliance with international grading standards
- Having our gemological research department constantly investigate new developments in the industry, which informs the grading process
💎 What’s the difference between a “GSI Certificate” and a “GSI Diamond Grading Report”?
GSI issues a variety of grading and identification reports. Consumers and industry professionals often call these reports “GSI Certificates”.