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- Adamas Gemological Laboratory - - Provides technical and gemological appraisal and consulting services to the trade and the public. Services, articles, and links.
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- European Gemological Laboratory USA - - Provides diamond, colored stone and pearls certification, analysis and consultations for the jewelry trade. Produces educational and promotional materials.
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- GemLab - - Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer. Offers diamond grading reports and appraisal services.
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- GemResearch Swisslab - - Determination of the authenticity and country of origin of a rubies and sapphires. Offers gemstone reports and inscriptions.
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- GIA Gem Trade Laboratory - - Provides grading and identification of diamonds, colored stones or pearls for the industry and consumers.
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- Realgems Gemological Laboratory - - Technical advisers, appraisers, gemological training. Services, background, and contact information. Located in Brazil.
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- Russian Gemological Server - - Offers gemstone analysis software, gemological education, and gemological laboratory services. Includes articles on diamond cut studies and a gallery of virtual diamond images.
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- SSEF Swiss Gemmological Institute - - An independent, international, non-profit organisation dedicated to the identification, treatment, and origin. Services, education, and contact information. Located in Switzerland.
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