First of all, diamond appraisal certificate, also known as diamondgradingreport and diamond qualityreport, is a report based on diamond 4C standard, which is formed by careful observation and testing of diamonds by jewelry experts in a specific environment according to strict grading standards. Diamond identification certificates are mainly divided into international certificates and domestic certificates, such as GIA, HRD, AGS, IGI, etc., all of which are international certificates and globally recognized, while there are many domestic certificates, such as NGTC, GAC, GIC, etc., mainly in the domestic market. Which diamond appraisal certificate is more reliable? Among many certificates, the most authoritative international certificate is GIA certificate (Gemological Institute of America). GIA is not only the maker of diamond 4C standard, but also an independent non-profit organization, which is famous for its fairness. Its diamond grading report is the most rigorous and in place, and the testing cost is also the most expensive. Moreover, the GIA certificate is internationally used, and the GIA certificate number is engraved on the waistline of each diamond, which not only ensures the uniqueness of the diamond, but also ensures that the certified diamond has a laser anti-counterfeiting label on its waist. Other international certificates also have their own characteristics and advantages in different aspects. Igi: The IGI Diamond Report is essentially a statement, which uses a world-recognized system to verify the authenticity of diamonds and provide reliable and correct diamond identity and grade. Each diamond is analyzed by many experienced appraisers using professional instruments to obtain an accurate description of the quality and characteristics of diamond cutting. Explain the details of diamonds in plain language. HRD:HRD diamond certificate also contains a complete description of diamond quality, including diamond shape, weight, clarity grade, fluorescence, color grade, specification, proportion, polishing grade, etc. These unique qualities determine the value of diamonds. It plays an important role in distinguishing whether diamonds are natural colored diamond or imitation diamonds! HRD diamond appraisal report mainly faces diamonds below 1 carat. AGS: Primary consumers can understand the classification of diamonds with simple numerical methods. Diamond processors and diamond wholesalers also use the detailed diamond information provided by the diamond certificate of the American Gemological Institute to buy batches of diamonds around the world. EGL: Our mission is to help consumers buy diamonds and precious stones. For more than 30 years, EGL's customers are mainly professional wholesalers, retailers and cutting factories. EGL also provides appraisal and teaching services. In addition, it also provides diamond polishing. The certificate issued by EGL is enough to provide all the information of diamonds, including physical properties such as weight, color, clarity and size, for the reference of the industry and consumers. In the United States and Belgium, EGL certification has a certain professional status and popularity. Which diamond appraisal certificate is more reliable?