Types of diamond certificates
Internationally recognized diamond grade certificates are as follows:
1, 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.
2. 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.
3. 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.
4. American Gemological Society-AGS Diamond Grade Certificate
American Gemological Society leads the industry by strict grading standards and providing detailed information. Primary consumers can understand the classification of diamonds with simple numbers and methods.
Diamond wholesalers and processors often use the detailed diamond information provided by AGS certificates to buy diamonds in batches around the world.
5. European Gemological Institute-EGL Diamond Grade Certificate
EGL was established in 1974, and its customers are mainly professional wholesalers, retailers and cutting factories. Its mission is to help consumers buy diamonds and precious stones.
In the United States and Belgium, EGL certification has a certain professional status and popularity. The appraisal certificate issued by it is enough to provide all the information of diamonds, including physical properties such as weight, color, clarity and size, for the reference of industries and consumers.
In 2008, EGL established an independent third-party diamond appraisal laboratory in Hong Kong, named EGLAsia, to provide safer and faster diamond appraisal services for Asian diamond customers. EGL Asia has set up two offices in Chinese mainland: the Shanghai office and the Shenzhen office.
6. 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.
7. American GemEx? Gemex Systems? Concurrent beauty certificate
GemEx？ Beauty certificate is a certificate to rate the brilliance (white light), fire color (colored light) and sparkle (flashing) of diamonds.
GemEx company is the most authoritative diamond optical appraisal institution in the United States, which pioneered the scientific measurement concept of diamond light efficiency certification. It is the first to use visual indicators (the beauty of diamonds) to evaluate and compare diamonds.
What are the diamond certificates in China?
1, NGTC diamond classification certificate
Issued by the National Jewelry and Jade Quality Supervision and Inspection Center. 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. It plays a guiding role in standardizing the domestic jewelry market and promoting the healthy development of the jewelry industry.
The diamond grading system used in the national inspection is mainly based on the cut, color and purity of diamonds. The highest grade is the rarest and most valuable diamond, and the lowest grade is the lowest.
2.CTA jewelry appraisal certificate
CTA is the abbreviation of China Quality Inspection Alliance and China Inspection Warner Quality Technology Center. CTA is supported by the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) and consists of dozens of international key provincial and municipal product quality supervision and inspection institutions. CTA is a comprehensive authoritative professional organization authorized by the state to engage in quality supervision and inspection and quality technical services. We have a group of experienced inspectors, auditors, auditors, inspectors, appraisers, quality engineers, standards experts, measurement experts and related industry technical experts with certain influence at home and abroad.
3.GJC Jewelry Inspection Certificate
Issued by the National Light Industry Jewelry Quality Supervision and Inspection Center. The center is a metrological certification unit of the State Bureau of Quality and Technical Supervision, and pursues scientific, fair and authoritative appraisal quality. While adhering to the national standards, the center staff has been committed to nondestructive appraisal of diamonds, colored gems and jade with reference to foreign standards, and has undertaken the tasks of gem appraisal and consultation and teaching from consumers, suppliers, sales companies, auction houses, pawn shops and public security courts. The appraisers of the center have won a good reputation and evaluation in Shanghai and even the whole country with their excellent professional skills and professionalism.
The appraisers in the center are composed of jewelry appraisers and appraisers who have obtained the national registered jewelry quality inspector certificate, GIA certificate from the United States, FGA certificate from the United Kingdom, HRD certificate from Belgium and GIC certificate from China. They insist on adopting national standards and referring to international standards to identify jewelry.
4.GAC diamond grading certificate
Awarded by China Gemstone Association. China Gemmological Association is referred to as "Gemmological Association of China" or "GAC" in English. China Gemstone Association is responsible for the quality supervision and inspection of self-discipline products in the national jewelry and jade jewelry industry, and invites local jewelry associations (merchants) to cooperate and assist in product quality self-discipline. China Gemstone Association is responsible for the quality supervision and inspection of self-discipline products in the national jewelry and jade jewelry industry, and invites local jewelry associations (merchants) to cooperate and assist in product quality self-discipline.