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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.globalgemlab.com/

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/