Asian Institute of Gemological Sciences

  [AIGS]

  B.G. & J. Co.,Ltd

  [Bangkok Gems & Jewelry Magazine]

  CMP Media (Thailand) Co.,Ltd.

  [Hong Kong Jewellery & Watch Fair]

  G. L. D. A.

  [Pan American Enterprises]

  GIA (International) Co.,Ltd.

  [Gemological Institute of America,

  Thailand Campus]

  Hong Kong Jewellery Magazine Ltd.

  [Hong Kong Jewellery Magazine]

  I.G.S Public Company Limited

  [Gemopolis]

  Jewel Fest Club

  [TGJTA : Jewel Fest]

  Jewellery World Review

  Thai Gem & Jewelry Traders Association

[TGJTA]

  Precious Business Co.,Ltd.

  [Thailand Gemstone]

  Vicenza

  [Vicenza ORO]