Gemological Institute of America

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5345 Armada Dr
Carlsbad, CA 92008
+1 (760) 603-4000
http://www.gia.edu
Gemological Institute-America is a nonprofit organization of gemological research and learning. The institute discovers and applies gemological knowledge to ensure the public trust in gems and jewelry. GIA s scientists, diamond graders and educators are regarded as one of the world s leading experts in gemology. The institute is the creator of the 4Cs of diamond value (color, clarity, cut and carat weight). It is also the corporate birthplace of the International Diamond Grading System. GIA s D-Z color-grading scale and Flawless I3 clarity-grading scale are recognized by nearly every professional jeweler and diamond buyer in the world. The Gemological Institute was established in 1931. Its world headquarters is in Carlsbad, Calif.

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Reviews

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3.546 reviews
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Danielle I.
8/29/2021

I felt the need to write a review of GIA after attending another jewelry school (New Approach School for Jewelers) that was an absolute nightmare. You can see my review of them over there. I...

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Dolphin W.
8/15/2025

Dreadful business. I will NOT be using GIA for any of my gems. 1) I contacted GIA by email asking if they were able to provide an origin report for a purple spinel. They sent me a form response...

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Sal F.
6/4/2025

Have no complaints,or negative comments for Supervisor Allianson proctor Veranica, or for GIA. Great job on the service and value...God bless

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Kevin V.
10/24/2025

Horrible company...The item had a 3rd party identification card by GLA out of Beverly Hills. GIA states things that are already listed on the GLA ID Card and would answer the meager inspection...

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EveKauai ..
7/18/2025

P.S. I contacted GIA and received a rude reply which didn't address my concerns/points. Instead, I was informed that GIA doesn't provide appraisals. In other words, their 'customer service'...

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