International Leading Gem Testing Laboratories

There are a number of competent, internationally recognizes gemological loboratories. The following list is not an endorsement, it is for information purpose only.

1. Gubelin Gem Lab Ltd.
   Maihofstrasse 102, CH-6000; Lucerne-9, Switzerland.
   Telephone: +41 041 4291717
   Fax: +41 041 4291734
   
   
2. Swiss Gemmological Institute (SSEF)
   Falknerstrasse-9, CH-4001 Basel, Switzerland.
   Telephone: +41 061 2620640
   Fax: +41 061 2620641
   
   
3. GIA Gem Trade Laboratory
   580, Fifth Avenue, NY 10036-4794, USA
   Telephone: +1 212 2215858
   Fax: +1 212 5753095
   
   
4. GIA Gem Trade Laboratory
   5355, Armade Drive, Carlsbad, CA 92008-4699, USA
   Telephone: +1 760 603 4500
   Fax: +1 760 603 1841
   
   
5. Tokyo Gem Laboratory (Thailand) co., Ltd
   987, Rama Jewellery building, 3rd Floor, Silom Road, Bangkok - 10500, Thailand.
   Telephone: 662 635 2030-2
   Fax: 662 635 2033
   
   
6. The Gem and Jewellery Institute of Thailand
   Gemmological Research and Testing Building, Faculty of Science, Chulalongkorn University, Phyathi Road, Patumwan, Bangkok 10330, Thailand.
   Telephone: 662 218 5470-4
   Fax: 662 218 5474
   
   
7. The Gemological Association and gem Testing Laboratory of Great Britain
   27, Greville Street, Saffron Hill Entrance, London ECIN 8TN, United Kingdom
   Telephone: 20 7404 3334
   Fax: 20 7404 8843
   Email: membership@gem.a.info
   Website: www.gem.a.info