Internationally recognized diamond grade certificates generally include the following:
Diamond Certificate
International Gemological Institute (IGI) - IGI Diamond Grade Certificate
p>Gemological Institute of America (GIA) - GIA Diamond Grade Certificate
Belgian Diamond Council - HRD Diamond Grade Certificate
American Gemological Institute - AGS Diamond Grade Certificate
European Gemological Institute - EGL Diamond Grade Certificate
National Jewelry and Jade Quality Supervision and Inspection Center - NGTC Diamond Grading Certificate
American GemEx? Systems, Inc Gemex Company - GemEx? GEM Certificate
1. International Gemological Institute (IGI) - IGI Diamond Grade Certificate
The International Gemological Institute IGI is the largest independent gemstone in the world It has 15 laboratories and schools in major diamond trading centers and central cities around the world (Antwerp, New York, Toronto, Dubai, Tokyo, Hong Kong, Tel Aviv, Los Angeles, and Mumbai), as well as gemological research and education institutions. Gemologists in more than 96 countries receive IGI's laboratory and educational and research services
Extensive experience, professional advice and long-term reputation for reliability and integrity have made IGI synonymous with the jewelry industry's reference standard. As the world's largest independent laboratory, IGI has developed patented technologies such as laser engraving and darkroom photography over decades of identification, and pioneered and promoted the 3EX cut evaluation system. It has long been a leader and standard setter in global gemology.
2. Gemological Institute of America (GIA) - GIA diamond grade certificate
The Gemological Institute of America is an independent non-profit organization. As one of the authorities in the gem industry in the world, Its certificates are well-known internationally. The institute's groundbreaking research and its own educational, experimental and equipment development processes chronicle the growth of the jewelry industry.
GIA Diamond Grading Reports and GIA Diamond Treatments are considered world-renowned gemstone certificates. Diamonds of all shapes and sizes are sent to the Academy from all corners of the world for analysis and grading.
3. The 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.
The HRD Diamond Color Report focuses on the detailed characteristics that determine the value of a colored diamond, such as color description, color design and luminescence. It plays an important role in separately detecting whether the diamond is a natural colored diamond or an imitation diamond.
4. American Gemological Society - AGS Diamond Grade Certificate
The American Gemological Society leads the industry through strict grading standards and providing detailed information. Novice consumers can understand diamond grading with the help of easy-to-understand numbers and methods.
Diamond wholesalers and processors often use the detailed diamond information provided by AGS certificates to purchase diamonds in bulk around the world.
5. European Gemological Institute - EGL Diamond Grade Certificate
EGL was established in 1974. Its customers are mainly professional wholesalers, retailers and cutting factories. It assists Consumers purchase diamonds and precious stones as a mission.
EGL appraisal has a certain professional status and popularity in the United States and Belgium. The identification certificate issued by it is sufficient to provide all the information of the diamond, including the weight, color, clarity, size and other physical properties of the diamond, for reference by the industry and consumers.
In 2008, EGL established an independent third-party diamond appraisal laboratory in Hong Kong, named EGLAsia, to provide Asian diamond customers with safer and faster diamond appraisal services. EGL Asia has established two offices in mainland China: Shanghai Office and 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 (referred to as the Inspection Center) is authorized by the relevant national competent authorities in accordance with the law. A national-level professional quality inspection agency for jewelry and jade, it is the authority on jewelry and jade testing in China. The diamond grading system used by the National Inspection and Quarantine Bureau also follows international practice and ranks diamonds in order according to their cut, color and clarity.
7. GemEx Systems, Inc. of the United States - GemEx certificate
The GemEx certificate is a test of the diamond’s Brilliance (white light), Fire Certificates for rating fire (colored light) and sparkle (degree of scintillation).
GemEx is the most authoritative diamond optical identification organization in the United States, and pioneered the concept of scientific measurement of diamond light effect certification. Pioneering the use of visual indicators (the beauty of diamonds) to evaluate and compare diamonds.
Authority:
GIA five stars★★★★★
IGI five stars★★★★★
HRD Five stars ★★★★★
On this point, there is nothing to question about the three companies, they are all international authoritative institutions. The international diamond grading standards are jointly maintained by these three companies. The certificates issued by them account for the vast majority of the market and are widely recognized around the world.
Information content:
The diamond information part of the international certificate will explain in detail everything from the size, weight, shape of the diamond to each cut index, and the accuracy of the description is extremely strict. , for example, the pavilion depth ratio: 48.3%, the cut grade will also be subdivided into several aspects, and the color clarity grade is accurate to a specific level. In addition, a detailed diagram of the diamond’s internal flaws can also be attached to the certificate as an aid to the clarity rating.
Reference materials: Diamond Certificate Baidu Encyclopedia