Gemmological Association and Gem Testing Laboratory of Great Britain
- Offers gem grading and identification services and gemmological courses for the trade and members.
- http://www.gem-a.info/

GIA Gem Trade Laboratory
- Provides grading and identification of diamonds, colored stones or pearls for the industry and consumers.
- http://www.gia.edu/gemtradelab/66/section_main_page.cfm

GemLab
- Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer. Offers diamond grading reports and appraisal services.
- http://www.gemlab.net/

GemResearch Swisslab
- Determination of the authenticity and country of origin of a rubies and sapphires. Offers gemstone reports and inscriptions.
- http://www.gemresearch.ch

European Gemological Laboratory USA
- Provides diamond, colored stone and pearls certification, analysis and consultations for the jewelry trade. Produces educational and promotional materials.
- http://www.eglusa.com

Global Gemological Laboratory
- Offers mini and full diamond grading reports and appraisals for the trade. Located in Bellevue, Washington
- http://www.globalgemlab.com/

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.
- http://www.gemology.ru/

American Gem Society Laboratories
- Provides diamond grading services featuring grading of the diamond cut.
- http://www.agslab.com/

New England Gemological Laboratory and Appraisal Services, LLC
- Fine jewelry appraisals by an independent team. Services, price list, and location map. In Manchester, CT.
- http://www.negemlab.com

Gubelin Gemmological Laboratories
- Independent service provides general information on gemstones, ongoing research and lab report services.
- http://www.gubelinlab.com/

Realgems Gemological Laboratory
- Technical advisers, appraisers, gemological training. Services, background, and contact information. Located in Brazil.
- http://www.realg.com.br

Adamas Gemological Laboratory
- Provides technical and gemological appraisal and consulting services to the trade and the public. Services, articles, and links.
- http://www.gis.net/~adamas/

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.
- http://www.ssef.ch/