- 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.
- 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
- New England Gemological Laboratory and Appraisal Services, LLC - Fine jewelry appraisals by an independent team. Services, price list, and location map. In Manchester, CT.
- 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.
Last update: May 4, 2013 20:19:00. Powered by Open Directory Project.