General Info

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.