Established in 1931, GIA is the world's largest and most respected nonprofit institute of gemological research and learning.
Conceived 75 years ago in the tradition of Europe's most respected institutes, GIA discovers (through GIA Research), imparts (through GIA Education), and applies (through the GIA Laboratory and GIA Instruments) gemological knowledge to ensure the public trust in gems and jewelry.
With 1,100 employees, the Institute's scientists, diamond graders, and educators are regarded, collectively, as the world's foremost authority in gemology.
GIA's groundbreaking scientific research has been covered for more than 65 years by its award winning quarterly journal, Gems & Gemology. The Institute's history of education, research, laboratory services, and instrument development reads much like a chronicle of the jewelry industry's own growth and sophistication.
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.
GIA produces a certificate for Laboratory Grown Diamonds. 
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