Diamond grade certificate: 5 stars
Also known as diamond grading certificate and diamond quality guarantee, it is a report based on 4C standard, which is formed by careful observation and testing of diamonds by jewelry experts in a specific environment according to strict grading standards.
2.GIA diamond grade certificate
Authority index: 5 stars
It was awarded by American Gemological Institute. Gemological Institute of America is an independent non-profit organization. As one of the world authorities, its certificate enjoys a high reputation in the world. The college's breakthrough research and its own education, experiment and equipment research and development process have witnessed the growth chronicle of the jewelry industry. GIA diamond classification report and GIA diamond processing are considered as world-famous gem certificates. Diamonds of all shapes and sizes are sent from all over the world to the college for analysis and classification. GIA Diamond Grade Certificate is issued by Winner Jewelry Diamond, which is corresponding to the national inspection and provincial inspection certificates, and provides double protection for consumers' rights and interests.
3, national inspection diamond grade certificate
Authority index: 5 stars
Issued by the National Jewelry and Jade Quality Supervision and Inspection Center. The National Jewelry and Jade Quality Supervision and Inspection Center is a national professional quality inspection institution authorized by the relevant competent departments of the state according to law, and it is the authoritative institution for jewelry and jade testing in China. The inspection center provides entrusted inspection services to the society, undertakes national market supervision and inspection, arbitration inspection, import and export commodity inspection, and formulates and revises relevant national standards. It plays a guiding role in standardizing the domestic jewelry market and promoting the healthy development of the jewelry industry.
4. Zhejiang Diamond Inspection Grade Certificate
Authority index: 5 stars
It was issued by Zhejiang Gold and Jewelry Quality Inspection Center. Zhejiang Gold and Jewelry Quality Inspection Center is a professional testing institution with the most complete testing equipment and the strongest testing ability in Zhejiang Province. It is the only designated unit for the ex-factory inspection of gold and silver products by the People's Bank of Zhejiang Province, and the only provincial jewelry professional skill appraisal station in Zhejiang Province authorized by the National Jewelry Management Center and approved by the Ministry of Labor.
5.HRD diamond grade certificate
Authority index: 4 and a half stars
It was awarded by the Belgian Diamond High Council. The Belgian Diamond High Council is officially recognized as representing the Belgian diamond trading industry. Its headquarters is located in Antwerp, the world diamond center. 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 diamonds or artificial diamonds. Some big diamonds in the winning number jewelry have been awarded HRD diamond grade certificates.