| Adamas Gemological Laboratory
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Provides technical and gemological appraisal and consulting services to the trade and the public. Services, articles, and links.
 URL: http://www.gis.net/~adamas/
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| American Gem Society Laboratories
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Provides diamond grading services featuring grading of the diamond cut.
URL: http://www.agslab.com/
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| European Gemological Laboratory USA
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Provides diamond, colored stone and pearls certification, analysis and consultations for the jewelry trade. Produces educational and promotional materials.
URL: http://www.eglusa.com
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| GemLab
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Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer. Offers diamond grading reports and appraisal services.
URL: http://www.gemlab.net/
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| Gemmological Association and Gem Testing Laboratory of Great Britain
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Offers gem grading and identification services and gemmological courses for the trade and members.
URL: http://www.gem-a.info/
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| GemResearch Swisslab
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Determination of the authenticity and country of origin of a rubies and sapphires. Offers gemstone reports and inscriptions.
URL: http://www.gemresearch.ch
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| GIA Gem Trade Laboratory
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Provides grading and identification of diamonds, colored stones or pearls for the industry and consumers.
URL: http://www.gia.edu/gemtradelab/66/section_main_pag...
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| Global Gemological Laboratory
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Offers mini and full diamond grading reports and appraisals for the trade. Located in Bellevue, Washington
URL: http://www.globalgemlab.com/
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| Gubelin Gemmological Laboratories
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Independent service provides general information on gemstones, ongoing research and lab report services.
URL: http://www.gubelinlab.com/
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| New England Gemological Laboratory and Appraisal Services, LLC
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Fine jewelry appraisals by an independent team. Services, price list, and location map. In Manchester, CT.
URL: http://www.negemlab.com
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| Realgems Gemological Laboratory
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Technical advisers, appraisers, gemological training. Services, background, and contact information. Located in Brazil.
URL: http://www.realg.com.br
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| Russian Gemological Server
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Offers gemstone analysis software, gemological education, and gemological laboratory services. Includes articles on diamond cut studies and a gallery of virtual diamond images.
URL: http://www.gemology.ru/
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| SSEF Swiss Gemmological Institute
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An independent, international, non-profit organisation dedicated to the identification, treatment, and origin. Services, education, and contact information. Located in Switzerland.
URL: http://www.ssef.ch/
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