LOCATION
Gem Testing Center
The Gem and Jewelry Institute of Thailand
(Public Organization) ITF-Tower Building.
4th Floor, Silom Road, Suriyawong
Bangrak, Bangkok 10500, Thailand

Tel: +66 2634 4999 ext. 409
Fax: +66 2634 4970
E-mail:

LAB HOURS
Mon - Fri: 08:30 - 16:30
Closed on Thai government public holidays

LAB FEES
Laboratory Disclosure Policy

Gem Identification Services

GIT's CIBJO Member (officially accredited by the World Jewellery Confederation since May 2000) has highly experienced gemologists and is equipped with the world's most advanced instruments. Its gem testing services include:

  • Identifying all types of natural, synthetic and imitation gemstones, including enhancements
  • Country-of-origin determination, especially for ruby, sapphire & emerald
  • Identifying all types of jade, including enhancements
  • Identifying natural, saltwater & freshwater cultured pearls; pearl enhancements
  • Identifying natural, synthetic & imitation diamonds, including enhancements
  • Diamond grading
  • Identifying gemstones, diamonds and fineness of precious metals
  • Diamond & Color stone Laser Inscription
Identification Reports

The center offers various types of gemstone reports as follows:

1. Gem Identification Report

This indicates gem variety, type, proportion, weight and includes a full description with a photograph of the gemstone. Quality grading of color for Ruby and Blue sapphire. The photograph of the gemstone is printed on a special type of paper which bears a three-dimensional hologram sticker to prevent counterfeiting.


2. Jade Report

This indicates jade variety, type, proportion, weight and includes a full description with a photograph of the jade. The photograph of the gemstone is printed on a security paper which bears a three-dimensional hologram sticker to prevent counterfeiting.




3. Pearl Report

This indicates pearl variety, type, proportion, weight and includes a full description with a photograph of the pearl. The photograph of the pearl is printed on a security paper which bears a three-dimensional hologram sticker to prevent counterfeiting.




4. Diamond Grading Report

The report indicates the variety, type, proportion, weight and the clear description including the quality of the diamond according to the 4Cs (Color, Clarity, Cut and Carat Weight)



5. Determination of Authenticity of Fancy Colored Diamond Report

This report indicates diamond variety, type, proportion, weight and includes a full description of authenticity of color diamond with a photograph of the diamond. The photograph of the diamond is printed on a security paper which bears a three-dimensional hologram sticker to prevent counterfeiting.



6. Jewelry Report

This indicates gem variety, type, proportion, weight, and the precious metal finess incluing in the type of report and includes a full description with a photograph of the jewelry. The photograph of the jewelry is printed on a security paper which bears a three-dimensional hologram sticker to prevent counterfeiting.




7. Gem Identification Mini Report

This indicates gem variety, type, proportion, weight and includes a photograph of the gemstone on matt art paper.