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	Gemmological Association and Gem Testing Laboratory of Great Britain - http://www.gem-a.info/ Offers gem grading and identification services and gemmological courses for the trade and members.
	SSEF Swiss Gemmological Institute - http://www.ssef.ch/ An independent, international, non-profit organisation dedicated to the identification, treatment, and origin. Services, education, and contact information. Located in Switzerland.
	American Gem Society Laboratories - http://www.agslab.com/ Provides diamond grading services featuring grading of the diamond cut.
	Gubelin Gemmological Laboratories - http://www.gubelinlab.com/ Independent service provides general information on gemstones, ongoing research and lab report services.
	http://www.gemlab.net/ - http://www.gemlab.net/ Specializes in origin of color determination for fancy colored diamonds using Raman spectrometer. Offers diamond grading reports and appraisal services.

	Russian Gemological Server - http://www.gemology.ru/ Offers gemstone analysis software, gemological education, and gemological laboratory services. Includes articles on diamond cut studies and a gallery of virtual diamond images.
	Adamas Gemological Laboratory - http://www.gis.net/~adamas/ Provides technical and gemological appraisal and consulting services to the trade and the public. Services, articles, and links.
	European Gemological Laboratory USA - http://www.eglusa.com Provides diamond, colored stone and pearls certification, analysis and consultations for the jewelry trade. Produces educational and promotional materials.
	GemResearch Swisslab - http://www.gemresearch.ch Determination of the authenticity and country of origin of a rubies and sapphires. Offers gemstone reports and inscriptions.
	Global Gemological Laboratory - http://www.globalgemlab.com/ Offers mini and full diamond grading reports and appraisals for the trade. Located in Bellevue, Washington

	New England Gemological Laboratory and Appraisal Services, LLC - http://www.negemlab.com Fine jewelry appraisals by an independent team. Services, price list, and location map. In Manchester, CT.
	Realgems Gemological Laboratory - http://www.realg.com.br Technical advisers, appraisers, gemological training. Services, background, and contact information. Located in Brazil.

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