America

• GIA - Gemological Institute of America
• AGS - American Gem Society Laboratories
• HKD - Diamond Laboratories Canada
• DGLA - Diamond and Gem Labs of America
• AGTA - American Gem Trade Association. Offers grading certificate service.
• AGA - Accredited Gemologists Association
• GCAL - Gem Certification and Assurance Lab, Located in New York.
• GS - GemScan Laboratories of America. Located in Dallas, Toronto & Mumbai
• Labtrade - Gemological Laboratory, located in Las Vegas & Bangkok

Europe

• EGL - European Gemological Laboratory
• HRD - Antwerp Institute of Gemmology
• Gubelin Lab - Switzerland based gemmological laboratory
• SSEF - The Swiss Gemmological Institute, part of the Swiss Foundation for the Research of Gemstones
• D Gem G - German Gemmological Association
• GemLab - Liechtenstein based gemmological laboratory
• LFG - Laboratoire Français de Gemmologie (France)

Asia

• AIGS - Asian Institute of Gemological Sciences
• GIT - The Gem and Jewelry Institute of Thailand
• GII - Gemmological Institute of India

Australia

• DCLA - Diamond Certification Laboratory of Australia
• ADGL - Australian Diamond Grading Laboratory

International

• IGI - International Gemological Institute
• WGI - World Gemological Institute