Diamond Institutes & Labs
The following is a list of the major recognized diamond institutes and laboratories used for grading, testing, and certification of diamonds:
Gemological Institute of America (GIA) - New York
American Gemological Laboratory (AGL) - New York
Gem Certification and Appraisal Lab (GCAL)
International Gemological Institute (IGI)
American Gem Trade Association - New York
European Gemological Laboratory (EGL) - New York
Hoge Raad voor Diamant (HRD) - Antwerp, Belgium
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Professional Gem Sciences (PGS) - Chicago, Los Angeles
Swiss Foundation for the Research of Gemstones - Basel, Switzerland