The Gilde Pearl Certificate of the United States began at 1980. It is a jewelry appraisal certificate issued by Gilde Gemological Laboratory in the United States, founded by American gemologist CharlesCarmona, and Gilde Gemological Laboratory has been devoted to the research and testing of gems. After more than 40 years of continuous development, the laboratory has formed a complete testing system, and the testing report framework is constantly updated and expanded. The types of test reports that can be issued include advanced report, routine test report, file test report and exclusive report, which are applicable to all kinds of gemstones and meet all kinds of gem test requirements in the market.

Real scientific research, known as "Zhu Zhen Research Institute of Japan", is one of the most authoritative and well-known jewelry appraisal institutions in Japanese pearl industry. Founded in 1987, the founder Dr. Komatsu graduated from Tokyo Fisheries University. Worked in the research room of Mikimoto, a famous Japanese pearl brand. After the establishment of the institute, he studied arts and crafts and obtained a doctorate. Zhu Zhen Institute of Science has a set of complete and rigorous system standards for the identification and classification of akoya pearls and Nanyang pearls, and strives to objectively and accurately show the quality of pearls to consumers.