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GIA is considered the world’s most trusted name in diamond
grading and gemstone identification. Since 1931, GIA has been
dedicated to ensuring the public trust in gems and jewelry by
upholding the highest standards of integrity, academics,
science, and professionalism. It is the corporate birthplace of
the International Diamond Grading System™ and the creator of the
famous 4Cs of diamond value – color, clarity, cut, and carat
weight.
GIA’s D-to-Z color-grading scale and Flawless-to-I3
clarity-grading scale are recognized by gem and jewelry
professionals everywhere. And, by extension, the GIA Diamond
Grading Report, Diamond Dossier®, and Gemological Identification
Report are considered the world’s premier gemological
credentials.
With laboratories in New York, California, Bangkok, an
additional research facility in Antwerp, 14 campuses, and more
than 1,100 employees worldwide, the Institute’s diamond graders,
researchers, and educators are regarded, collectively, as the
world’s foremost authority in gemology. And together, they carry
on GIA’s proud tradition of research, discovery, and education.