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/

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/

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

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

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

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.gagtl.ac.uk/

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

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

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

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

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/