 | Adamas Gemological Laboratory - Provides technical and gemological appraisal and consulting services to the trade and the public. Services, articles, and links.
| American Gem Society Laboratories - Provides diamond grading services featuring grading of the diamond cut.
| European Gemological Laboratory USA - Provides diamond, colored stone and pearls certification, analysis and consultations for the jewelry trade. Produces educational and promotional materials.
| GemLab - Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer. Offers diamond grading reports and appraisal services.
| Gemmological Association and Gem Testing Laboratory of Great Britain - Offers gem grading and identification services and gemmological courses for the trade and members.
| GemResearch Swisslab - Determination of the authenticity and country of origin of a rubies and sapphires. Offers gemstone reports and inscriptions.
| GIA Gem Trade Laboratory - Provides grading and identification of diamonds, colored stones or pearls for the industry and consumers.
| Global Gemological Laboratory - Offers mini and full diamond grading reports and appraisals for the trade. Located in Bellevue, Washington
| Gubelin Gemmological Laboratories - Independent service provides general information on gemstones, ongoing research and lab report services.
| Hyderabad Institute of Gems and Jewellery - Offers gemological and jewelry design cources.
| New England Gemological Laboratory and Appraisal Services, LLC - Fine jewelry appraisals by an independent team. Services, price list, and location map. In Manchester, CT.
| Realgems Gemological Laboratory - Technical advisers, appraisers, gemological training. Services, background, and contact information. Located in Brazil.
| 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.
| 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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