Established in 1931, the nonprofit Gemological Institute of America (GIA) is one of the world's foremost authorities in gemology.

GIA's mission is to ensure the public trust in gems and jewelry by upholding the highest standards of integrity, academics, science, and professionalism through education, research, laboratory services, and instrument development.
Because diamonds are so valuable, it’s essential to have a universal grading system for comparing their quality. In the 1940s and ’50s, GIA developed the 4Cs and the GIA International Diamond Grading System to objectively compare and evaluate diamonds.  

The difference between wondering and knowing – no matter how close you look, you will not see what we see. GIA is the creator of the famous 4Cs of diamond value (color, clarity, cut and carat weight).

GIA Laboratories that serve the diamond grading needs of the world are now operational in South Africa, Botswana, India and Thailand, in addition to the US locations in New York and Carlsbad. Plans are in-hand to further expand the GIA Laboratory’s diamond grading outreach to other parts of the world; however, GIA Laboratory Bangkok, located in Thailand, is presently the only full-service (diamond grading, colored stone identification and origin determination, pearl identification and the all important research element) GIA Laboratory outside the United States of America.

GIA Laboratory, Bangkok started as GIA research Thailand in 2006. It provides a significant research element for both the local and international colored gemstone community through its renowned Field Gemology Program, detailed sample analyses, and on-line PDF publications. This research element significantly supporting the gemstone identification and origin determinations the GIA Laboratories in Bangkok, Carlsbad and New York make for the industry and consumers alike.

GIA Laboratory Bangkok is conveniently located in the U-Chu-Liang Building located immediately opposite Lumpini Park, between Sathorn and Silom, on Rama IV Road. The building is within a few minutes walk of the Skytrain and Subway stations is served by two taxi ranks and has ample in-building parking,

The GIA Laboratory Bangkok facility, located on the 10th floor, is state of the art in every respect. Goods, personnel and clients are protected by very high levels of security. Staff training and experience is amongst the best in the world and equipment specifications are equal to the world’s finest gemological facilities.