| COUNTRY | NAME | ADDRESS | CITY | ZIP CODE |
| | | | | |
| Australia | Gemmological Association of Australia | Queensland Branch, 20 Rosslyn Street, East Brisbane | Quensland | 4169 |
| | Gemmological Association of Australia | South Australia Branch, G.P.O Box 5133 AA | Melbourne | |
| Belgium | European Gemological Laboratory | Rijfstraat 3 | Antwerp | |
| | HRD Institute of Gemology | Diamond High Council | Antewerp | |
| Brazil | Universidad Federal de Oro Preto | Escola de Minas, Praca Tiradentes, 20 | Oro Preto MG | 35400 |
| Canada | Carleton University | Otawa | Ontario | K1S5B6 |
| | George Brown College of Applied Arts & Techonology | P.O Box 1015 Station B, Toronto | Ontario | M5T2T9 |
| | Pacific Institute of Gemology | P.O Box 6902, Vancouver, BC | Vancouver | V5k4W3 |
| | Canadian Gemmolgical Association | 1767 Avenue Road, North York | Ontario | M5M3Y8, |
| England | Departament of Mineralogy British Museum (Natural History) | Cromwell Rd. | London | SW75BD, |
| | Gemologiacal Association of Great Britain | 2 Carey Lane | London | EC2, |
| | Gemmological Laboratory | Benedict Building St, George´s Way, Stocton Road | Sunderland | SR27BW, |
| | Huddlestone Gemmological Consultants Ltd | 100 Hatton Garden Suite 221 | London | ECIN8NX, |
| France | Institut de Gemmologie (ING) | 48 Rue Due Faubourg Montmartre | Paris | 75009 |
| Germany | Deutsche Gemmologische Gesellschaft | Prof. Schlossmacher-Str.1, P.O Box 12 22 60 | Idar-Oberstain | D6580 |
| Hong Kong | G.I.A Hong Kong | Unit # 1211B, 12/f, Block A, Focal Industrial Center, 21 Man Lock Street, Hunghom Kowloon | Hong Kong | |
| | The Hong Kong Institute of Gemmology | 1104 Blissful Building, 247 Des Voeux Road Central | Hong Kong | |
| | The Gemmological Association of Hong Kong | TST P.O Box 89771, Kowloon | Hong Kong | |
| Israel | E.G.L Gemological Institute for Precious Stones | Noam Bldg, Bezalel St.52 | Ramat Gan | |
| | Gemmological Association of Israel | 1 Jabotinsky St. | Ramat Gan | 52520, |
| Italy | G.I.A S.R.L (Italy) | Via Vecchia Ferriera 70 | Vicenza | 36100 |
| | Instituto Gemmologico Mediterraneo | Via Marmolaia 14 | Cavalase | 38033 |
| | Gemval s.n.c Instituto Analisi Gemologico | Via Sassi, 44 | Valenza | 15048 |
| Japan | Association of Japan Gem Trust | 2-3F Okachimachi Cy Bldg, 5-15-14 Ueno, Taito-ku | Tokyo | T110 |
| | G.I.A | 2-3F Okachimachi Cy Bldg, 5-15-14 Ueno, Taito-ku | Tokyo | T110 |
| | Central Gem Laboratory | Taiyo Bldg., 15-17,5-Chome, Veno,Taito-ku | Tokyo | 104 |
| | Gemmological Association of All Japan | Tokio-bihokaikan, 1-24 Akashi-cho, Chuo-ku | Tokyo | 104 |
| Korea | Mi-Jo Gem Study Institute, | 244-39 Huan-dog Yongsan-Ku | Seoul | 140-190 |
| | G.I.A KOREA | Kangnamku Sinsadong 638-4, Kyung Jin Building-2nd Floor | Seoul | |
| Netherlands | Netherlands Gem Laboratory | Hooglandse Kekgracht 17, 2312HS | Leiden | |
| USA | Holland School for Jewelers | 231 Road St Box 882 Selam, AL 36701 | Selam | |
| | International Gemological Services | 4160 North Scottsdale | Scottsdale | AZ 85251 |
| | Gemological Institute of America GIA | The Robert Mouawad Campus5345 Armada Drive | Carlsbad | CA 92008 |
| | Gemological Institute of America GIA | New York Campus
580 5th Avenue | New York | NY 10036-4794 |
| | Institute of Jewelry Training | 3901 Northwood Av. Suite B | Sacramento | CA 90404 |
| | Jewelry Technical Institute | 1283 Western Ave. Garden Grove | Garden Grove | CA 90404 |
| | Revere Academy of Jewelers Arts | 760 Market # 939 | San Francisco | CA 90402 |
| | American Society of Apraisers | Box 17265 | Washington | DC 20041 |
| | Keno Gemological Bureau | 2000 E. Sunrise Blvd. | Ft. Lauderdale | FL 33304 |
| | Art Institute of Atlanta | 3376 Peachtree Rd. N.E. | Atlanta | GA 30326 |
| | Atlanta Foundation for Jewlery Studies | 110 E. Andrews Drive, #203 | Atlanta | GA 30305 |
| | Emory University | Evening at Emory | Atlanta | GA 30322 |
| | Oglethorpe University | 4484 Peachtree Rd. N.E. | Atlanta | GA 30319 |
| | Parkland College | 2400 W. Bradley Ave. | Champaign | IL 61820 |
| | International Gemological School | 3100 Ridgelake Drive Suite 301 | Metairie | LA 70002 |
| | Columbia School of Gemology | 8600 Fenton St. | Silver Spring | MD 20910 |
| | Diamond Council of America | 9140 Ward Parkway | Kansas City | MO 64114 |
| | Fashion Institute of Technology | 227 West 27th St. | New York | NY 10036 |
| | Yeshiva University | Midtown center 245 Lexington Ave. | Lexington | |
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