Gemological Institute of America

Provides grading and identification of diamonds, coloured stones or pearls for the industry and consumers.
GIA New York
Homepage Address Contact 580 Fifth Avenue
Suite 200
New York 10036
United States of America
N: Jan Tilton
T: 212-221-5858
F: 212-575-3095

GIA is considered the world's most trusted name in diamond grading and gemstone identification. GIA’s D-to-Z colour-grading scale and Flawless-to-I3 clarity-grading scale are recognized by gem and jewellery professionals everywhere. And, by extension, the GIA Diamond Grading Report, Diamond Dossier, and Gemological Identification Report are considered the world’s premier gemological credentials.