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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/
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.jewelrycategory.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/
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