In fact, their two certificates are authoritative all over the world. GIA (American Gemological Logic Institute) American Gemological Institute was founded by Robert shipley in 193 1 year, and has a history of nearly 8 1 year. GIA is a non-profit organization with a good reputation, and its funds are donated by people in the jewelry industry, which is quite credible in terms of the quality of the appraisal. GIA is a non-profit organization, and its funds are donated by people in the jewelry industry. Its main service scope is the education and research of jewelry design and professional knowledge, which has been recognized by the global jewelry industry. Up to now, GIA has 14 teaching institutions around the world, providing professional courses such as research, sales and appraisal, cultivating high-quality jewelry practitioners, and also contributing to GIA's lofty reputation in the industry, so that the public can always maintain a leading position in the world in terms of trust and professionalism. GRS is a gem appraisal institution founded by Dr. A. Peretti, a Swiss gemologist. Can independently issue test reports. Mainly used to detect the world's major gems, such as rubies, sapphires, emeralds, golden green cat's eyes and so on. At present, only Bangkok and Hong Kong in Thailand have laboratories, and the appraisal fees range from 100-300 USD. At present, GRS has offices in Sri Lanka, Thailand and Hongkong, China except Switzerland, and the appraisal fee ranges from 65,438+000-300 USD. GRS enjoys a high evaluation reputation in the Asia-Pacific region and is one of the three largest laboratories in Switzerland. Together with SSEF and Gubyrin Lab, it is a world all year round.