GIA

The Gemological Institute of America (GIA), an independent nonprofit organization, was the first organization in the U.S. to provide lab certificates for diamonds. Established in 1931, GIA is the world’s foremost nonprofit institute of gemological research and learning.
GIA discovers, imparts, and applies gemological knowledge to help ensure the public trust in gems and jewelry. With over 800 employees, the Institute’s world-renowned scientists, researchers, gemologists, and educators have become recognized as the final authority on diamond grading and gem identification.

For example, GIA is the creator of the famous 4Cs of diamond value (color, clarity, cut, and carat weight). It is also the corporate birthplace of the International Diamond Grading System™. Today, GIA’s D-Z color-grading scale and GIA’s Flawless–I3 clarity-grading scale are recognized by virtually every professional jeweler and savvy diamond buyer in the world.

Internationally, GIA has become synonymous with the values of knowledge and integrity. And because of this, the Institute is regarded as the world’s foremost authority in gemology™. It is where diamonds from all over the world are sent for analysis and grading.