There are a number of competent, internationally recognizes gemological loboratories. The following list is not an endorsement, it is for information purpose only.
- Gubelin Gem Lab Ltd.
Maihofstrasse 102, CH-6000; Lucerne-9, Switzerland.
Telephone: +41 041 4291717
Fax: +41 041 4291734 - Swiss Gemmological Institute (SSEF)
Falknerstrasse-9, CH-4001 Basel, Switzerland.
Telephone: +41 061 2620640
Fax: +41 061 2620641 - GIA Gem Trade Laboratory
580, Fifth Avenue, NY 10036-4794, USA
Telephone: +1 212 2215858
Fax: +1 212 5753095 - GIA Gem Trade Laboratory
5355, Armade Drive, Carlsbad, CA 92008-4699, USA
Telephone: +1 760 603 4500
Fax: +1 760 603 1841 - 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 - 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 - 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
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