What are the international diamond appraisal institutions? 1.GIA (American Jewelry Institute) The American Jewelry Institute was established in Los Angeles 193 1. It founded and put forward the international scoring system. Headquartered in Los Angeles. The college is trusted in the field of diamond grading and gem identification, and is famous for its knowledge and expert position in gem creation. In fact, GIA diamond classification report and GIA diamond processing are considered to be the first gem certificates in the world. Diamonds of all shapes and sizes are sent from all corners of the world to the college for analysis and classification. Second, HRD (Belgian Diamond High Council) The Belgian Diamond High Council hopes to further develop Antwerp into a world diamond center. On the one hand, it represents Belgium, foreign governments and professional organizations in this field. On the other hand, by promoting the transactions in the jewelry and jade market, we will promote the relevant knowledge in the diamond field. The Belgian Diamond High Council is officially recognized as representing the Belgian diamond trading industry. The Belgian Diamond High Council is headquartered in Antwerp, the world diamond center. The Belgian Diamond High Council issued three certificates. HRD diamond certificate guarantees the authenticity of diamonds and judges the possibility of counterfeit or artificial diamonds. Of course, the certificate also contains a complete description of the quality of the diamond, including shape, weight, clarity grade, fluorescence, color grade, specification, proportion, polishing grade and so on. These unique qualities determine the value of diamonds. HRD diamond appraisal report is mainly aimed at diamonds below 1 carat, which is an efficient and quick service. HRD diamond color certificate focuses on the detailed characteristics that determine the value of colored diamond, such as color description, color design and luminescence. It plays an important role in detecting whether diamonds are natural colored diamond or imitation diamonds. Three. IGI (World Gemological Institute) The World Gemological Institute, located in Antwerp, is the oldest gemological institute. 1975 has established laboratories in new york, Bangkok, Mumbai and Tokyo. The essence of the IGI Diamond Report is to prove the authenticity of diamonds with the help of a world-recognized system, and to provide a reliable and correct statement of diamond identity and grade. Each diamond is analyzed by several experienced professional instruments, and the accurate description of diamond characteristics and cutting quality is obtained. By explaining the detailed information of diamonds in easy-to-understand language, we can accurately appreciate diamonds of different qualities. The grade and quality of each diamond are generally based on 4C: carat weight, color, clarity and cut. These analytical structures are recorded in the IGI Diamond Report. 4.EGL (European Gemological Institute) Some people say that their grading standards are not strict enough. There are also examples involving forged certificates. Some industry experts said that this is not the fault of the European Gemological Institute and its classification practice, but an additional benefit, because the diamonds identified by EGL are usually cheaper than those identified by GIA and AGS. V. AGS (American Gemmological Society) The American Gemmological Society leads the industry through strict grading standards and providing detailed information. Primary consumers can understand the classification of diamonds through simple digital methods. Diamond processors and diamond wholesalers also use the detailed diamond information provided by the American Gemological Institute's diamond certificate to buy bulk diamonds all over the world. Three. IGI (World Gemological Institute) The World Gemological Institute, located in Antwerp, is the oldest gemological institute. 1975 has established laboratories in new york, Bangkok, Mumbai and Tokyo. The essence of the IGI Diamond Report is to prove the authenticity of diamonds with the help of a world-recognized system, and to provide a reliable and correct statement of diamond identity and grade. Each diamond is analyzed by several experienced professional instruments, and the accurate description of diamond characteristics and cutting quality is obtained. By explaining the detailed information of diamonds in easy-to-understand language, we can accurately appreciate diamonds of different qualities. The grade and quality of each diamond are generally based on 4C: carat weight, color, clarity and cut. These analytical structures are recorded in the IGI Diamond Report. 4.EGL (European Gemological Institute) Some people say that their grading standards are not strict enough. There are also examples involving forged certificates. Some industry experts said that this is not the fault of the European Gemological Institute and its classification practice, but an additional benefit, because the diamonds identified by EGL are usually cheaper than those identified by GIA and AGS. V. AGS (American Gemmological Society) The American Gemmological Society leads the industry through strict grading standards and providing detailed information. Primary consumers can understand the classification of diamonds through simple digital methods. Diamond processors and diamond wholesalers also use the detailed diamond information provided by the American Gemological Institute's diamond certificate to buy bulk diamonds all over the world.