GSI Reviews

GSI Diamond Certification
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GSI: Gemological Science International
Average rating:  
 13 reviews
by Jessica on GSI: Gemological Science International
I would like to thank the GSI team for helping my customer with a certificate

I would like to thank the GSI team for helping my customer with a certificate urgently after she misplaced her report. This helps the customer believe in the services of GSI as a brand and helps us maintain goodwill as well. Thank you, GSI, for your professional and prompt services.

by Stephen on GSI: Gemological Science International
GSI retail training has helped me and my staff understand diamonds better

GSI retail training has helped me and my staff understand diamonds better. This also helps us explain to our customers the importance of certification, and how to read a diamond report, which helped us sell better. GSI is a well-known diamond grading brand, which adds value to our sales as well.

by Janet on GSI: Gemological Science International
GSI certificates have helped our sales

GSI certificates have helped our sales. Most of our customers insist on a GSI certificate because of their reliable and accurate grading certificates, which also helps me a retailer. Customers who trust GSI also trusts us and our quality! The GSI team goes out of their way to help in queries regarding jewelry cleaning, gemstone information, loss of certificate, etc.

by Patrick on GSI: Gemological Science International
Recently I have purchased diamond studs for my mother.

Recently I have purchased diamond studs for my mother. However, jeweler misplaced certificate and suggested that I contact GSI with certificate number. I have contacted GSI and asked them to send me paperwork for the purchase. The studs I ordered were for a Christmas present and needed the certificate urgent. GSI sent certificate overnight and I had time to wrap and prepare Christmas gift for my mother right on time.

by John on GSI: Gemological Science International
Really happy with the ring and GSI report

I purchased a diamond engagement ring online for my fiancée , which was delivered along with a GSI certification. It arrived with a GSI diamond certificate. To be on the safe side, I got the ring appraised through a local jeweler. The diamond grades were accurate, as mentioned in the GSI report. Really happy with the ring and GSI report. Thank you!

by Shubham on GSI: Gemological Science International
I have successfully completed the GSI diamond grading certification.

I have successfully completed the GSI diamond grading certification. What I love the most about it is that it is educational and practical. There were specific questions I had pertaining to my family run business. The trainer was happy to engage in discussion with me after the course hours. The course benefitted me a lot as it covered even pricing and other sales tactics! 100% suggested to someone who is looking out to be a professional in the diamond industry.

by David on GSI: Gemological Science International
I am a jewelry professional, and I also own a store.

I am a jewelry professional, and I also own a store. I always opt for a GSI certificate for my store jewelry because of its accuracy and reliability. I have worked with other labs before, but GSI turned out to be the best and most consistent. A diamond certified by GSI is always accurate. The grades are consistent and reliable due to their high grading standards. I would 100% recommend insisting on the GSI report.

by Shweta on GSI: Gemological Science International
Базовый курс GSI по классификации бриллиантов

The GSI diamond grading fundamental course covers right from the essential 4cs to diamond pricing. The course also covered lab grown diamonds and simulants and has been really interesting for me. The trainer has been accommodating to my queries, attentive, and gave personalized attention to each student. Would definitely recommend it to anyone who is looking forward to deep dive into the diamond world.

by Arya on GSI: Gemological Science International
I am impressed because of their fast service

I am from Australia and had bought a diamond pendant from the USA during my vacations. It had come with a GSI certification card. I misplaced my certificate during traveling, and I panicked as it was an essential diamond document. I contacted GSI immediately with all the details I had, and they emailed me a copy of my certificate. I am impressed because of their fast service. The staff was courteous and accommodating towards my issues.

by Megan on GSI: Gemological Science International
Thank you for offering such good service. Thank you, GSI!

My boyfriend purchased a diamond for my engagement ring, and I noticed there was not a cut grade listed. I got concerned and thought that something is wrong with it. It didn’t look to me normal and I contacted GSI. They explained to me that my diamond was Leo diamond and because it is not regular diamond it doesn’t have cut grade, but nothing is wrong with my diamond. It’s just opposite. Leo diamond has very unique features. Thank you for the help!

by Margie M on GSI: Gemological Science International
I really like your Virtual Vault service

I really like your Virtual Vault service. It is very helpful, not only you have my jewelry information, but I also received updated appraisal by emailing to GSI and didn’t have to go jeweler. Once again, thank you for offering such good service. Thank you, GSI!

by Helen on GSI: Gemological Science International
I purchased earrings from Kay Jewelers and had some questions about weight of the diamonds.

I purchased earrings from Kay Jewelers and had some questions about weight of the diamonds. I called GSI and asked them about diamond weight and few other questions about diamonds in my new earrings. The staff was extremely informative, and helpful. They explained everything very well and taught me how to read a certificate while purchasing a diamond. They also gave me jewelry care tips.

by Brandy S. on GSI: Gemological Science International
I got copy of my GSI certificate

I recently purchased a Neil Lane ring from a private seller which I believe has a certified diamond through GSI. How I found out about the certification was when I was getting my ring appraised through a local jeweler. He gave us an appraisal based off the ring set without a certification due to myself not having the paperwork. He gave us the certification number in the diamond to contact you and see if we can get the paperwork for the certification. Once we get the paperwork for the diamond, we would then be able to go to the jeweler to get an updated value of the ring set. We are trying to get the value of the ring for insurance purposes. I was not sure how to proceed and contacted GSI toll free number. Person on the phone was very helpful and took my information. Few days later I got copy of my GSI certificate and was able to get new appraisal from my jeweler.

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