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Universal Gemological Laboratories (GCI) is a gemological laboratory and a college for educational services founded in 1998. The laboratory's main headquarters is in the Israel Diamond Exchange in Ramat Gan. The GCI has regional labs and educational centers equipped with local and Israeli staff in Russia and, since June 2006, in India—a disposition of four branches in Mumbai, Delhi, Hyderabad and Kolkata. GCI is the only western laboratory that is officially permitted by the Russian government to operate in Russia.

As a licensed member of the Association of Gemological Laboratories of Japan (AGL), the gemological laboratory TGL Israel is officially registered and recognized by JJA^{[citation needed]}/AGL Master Stones (color) administrative committee. The AGL was established in 1981 for the purpose of standardization of diamond grading based on the method used at the Gemological Institute of America (GIA) and on the nomenclature of color in diamonds as used by the association of Gemological Laboratories in Japan (AGL). GCI is working under the strict standard institution of International Organization for Standardization (ISO).^{[1][better source needed]}

GCI conducts research on gemstones. All publications are free to access via the GCI website (English/Hebrew).^{[citation needed]}

Various courses are offered by the college, and the curriculum trains the students in diamond grading, gem identification and practical work.^{[citation needed]}

• Rapaport's global guide to gemological laboratories vol.28 no.41 November 2005
• IGC changes name and strengthens status as education provider IDEX MAGAZINE NO 226: POLISHED - February 9 Page 76
• Making the diamond education grade IDEX MAGAZINE NO 228: POLISHED - April 9 pages 94–97
• Organization profile gci gemological centers inc IDEX MAGAZINE NO 228: POLISHED - April 9 page 113
• Yakar, Ben-Zion (August 2010) The impact of HPHT on a diamond's colour Solitaire Magazine pages 95–98
• Pelerinaj stralucitor The One Magazine: pages 84–85

• GCI - Official site Archived 2011-07-22 at the Wayback Machine
• SSEF FACETTE, International Issue No. 12, January 2005
• Israelidiamond.co.il