International Gemological Institute (IGI) ——IGI Diamond Grade Certificate
IGI, the International Gemological Institute, is the world's largest independent gem identification laboratory and gem research and education institution. It has 65,438+05 laboratories and schools in major diamond trading centers and central cities around the world (Antwerp, new york, Toronto, Dubai, Tokyo, Hongkong, Tel Aviv, Los Angeles and Mumbai), and gemologists from more than 96 countries around the world receive laboratory, education and scientific research services from IGI.
Rich experience, professional advice and long-term reputation for reliability and integrity make IGI synonymous with reference standards in jewelry industry. As the largest independent laboratory in the world, IGI has developed patented technologies such as laser lettering and darkroom photos, which have been appraised for decades, and initiated and popularized the 3EX cutting evaluation system. For a long time, it has been a global leader and norm-setter in the field of gemology.
Gemological Institute of America (GIA) ——GIA Diamond Grade Certificate
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.
Belgian Diamond High Council -HRD Diamond Grade Certificate
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 diamond or imitation diamonds.
National Jewelry and Jade Quality Supervision and Inspection Center -NGTC Diamond Grading Certificate
The National Jewelry and Jade Quality Supervision and Inspection Center (hereinafter referred to as the 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 diamond grading system used in national inspection also follows international practice, and diamonds are graded in turn according to cut, color and clarity.