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American Gem
Provides diamond grading services featuring grading of the diamond cut.
http://www.agslab.com/

Asian Institute of Gemological Sciences
The AIGS Gemstone Identification, Grading and Research Laboratory was the first professional gemological laboratory to be established in Asia in 1978.
http://www.aigsthailand.com

Bernie's Lapidary Supply Company
Distributes a range of jewelry, silversmith tools, lapidary supplies, and related equipment.
http://www.bernieslapidary.com/

Daniel Lopacki Co.
Lapidary tools including saw blades, carving burrs, diamond powders, flat laps, and more.
http://www.lopacki.com/

Desert Outfitters, Inc.
Prospecting, lapidary, and backpacking gear and equipment.
http://www.desertoutfitters.com/

European Gemological
Provides diamond, colored stone and pearls certification, analysis and consultations.
http://www.eglusa.com/

GemLab
Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer.
http://www.gemlab.net/

GemResearch
Determination of the authenticity and country of origin of a rubies and sapphires.
http://www.gemresearch.ch/

Global Gemological
Offers mini and full diamond grading reports and appraisals for the trade.
http://www.friedmanjewelers.net/

Kingsley North, Inc.
National distributor of lapidary/jewelry equipment and supplies.
http://www.kingsleynorth.com

Realgems Gemological
Technical advisers, appraisers, gemological training.
http://www.realg.com.br/

Russian Gemological
Offers gemstone analysis software, gemological education, and gemological laboratory services.
http://www.gemology.ru/