Global authority on gemology and creator of the 4Cs, providing the world's most trusted diamond grading reports.
ORIGIN
USA
PRICE TIER
luxury
Founded in 1931 in Carlsbad, California, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. As a non-profit institute, GIA does not sell jewelry but serves as the independent guardian of public trust in the gem trade. It is best known for creating the "4Cs" (Color, Cut, Clarity, and Carat Weight) and the International Diamond Grading System™, which remain the universal standard for evaluating diamond quality.