| 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. |
| 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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