The GIA Laboratory is the world’s most trusted name in diamond grading and gemstone identification. 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. The two other full-service laboratories are located in New york and Carlsbad (California):

With facilities in New York, California, Bangkok, Mumbai, Johannesburg, and Gaborone as well as six international service centers, the GIA Laboratory is regarded as the world’s foremost authority in gemology: