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American Gem - Provides diamond grading services featuring grading of the diamond cut.
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.
European Gemological - Provides diamond, colored stone and pearls certification, analysis and consultations.
GemLab - Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer.
GemResearch - Determination of the authenticity and country of origin of a rubies and sapphires.
Global Gemological - Offers mini and full diamond grading reports and appraisals for the trade.
Realgems Gemological - Technical advisers, appraisers, gemological training.
Russian Gemological - Offers gemstone analysis software, gemological education, and gemological laboratory services.
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