1. Gem Institute
America) American Gemological Institute, founded by Mr. Robert on 193 1
Founded by shipley, it has a history of nearly 865,438+0 years. GIA is a non-profit organization in reputation, and its funds are donated by people in the jewelry industry. Judging from the quality of the appraisal, it is quite credible.
2.GRS (Swiss Laboratory for Gemological Research) Swiss Gemological Research and Appraisal Institute was founded by Dr. A on 1996.
Founded by Peretti, the certificate can indicate the origin and optimization of rubies, sapphires, emeralds and other gems. At present, only Bangkok and Hong Kong in Thailand have laboratories, and the appraisal fees range from 100-300 USD.
3.AIGS (Asian Gemological Science Institute)
) Asian Gemological Institute, 1978, founded in Bangkok, Thailand, is the first jewelry education institution in Southeast Asia.