The top five diamond identification agencies in foreign countries are: GIA, HRD, EGL, AGS, IGI.
GIA (Gemological Institute of America)
Founded in 1931, it has been more than 70 years. GIA is aiming to raise the morality of the industry and protect the rights of the public. GIA is the creator of the Diamond 4C standard.
There are two types of GIA certificates:
DIAMONDGRADINGREPORT (大è¯)
DIAMONDDOSSIER (small certificate) - The small certificates are mainly diamonds below one carat, and all have laser engraved certificate numbers on the waist.
European Gemological Institute EGL (EuropeanGemologicalLaboratory)
Founded in 1974, the president is GuyMargel with a degree in geology. He opened the first accreditation center in Europe, Antwerp, EGL. With the mission of helping consumers purchase diamonds and precious stones, EGL's customers have been focusing on professional pifa merchants, lingshou stores and cutting factories for more than 30 years. EGL also provides identification and teaching services, in addition to diamond heavy car polishing, EGL issued a certificate sufficient to provide all the information of the diamond, including the weight, color, clarity, size and physical properties of the diamond, For industry and consumer reference. EGL in the United States and Belgium identify all certain professional status and popularity.
Belgian Diamond High Class Council HRD (AntwerpDiamondHighCouncil)
If GIA is the most common naked diamond certificate appraisal institution in China or the United States, then HRD is the most common in Europe. Founded in 1973, HRD is an officially accredited body of the Belgian government. It is headquartered at the World Diamond Center in Antwerp. It adopts a system that complies with the “International Appraisal Rules†and was the only World Trade Union Alliance in the World Conference in May 1978. (WFDB) and the International Diamond Manufacturers Association (IDMA) are recognized standards.
American Gem Society AGS (American GemSociety)
Founded in 1934, AGS was founded by Robert M. Shipley, who is also the founder of GIA, the American Gemological Institute. In the early 1990s, AGS was committed to the development of a diamond classification system. The biggest difference from other identification systems is that in addition to the weight (CaratWeight), AGS puts the diamond's Cut color (C). Clarity), from the best 0 to the worst 10, divided into ten levels. In addition, the AGS Diamond Grading System formulates the most important Cutter in the 4C of the diamond, which in turn brings the diamond mechanic into the car. New miles.
Since 1996, the emphasis on the AGS certificate of Cut has become the standard for the international diamond industry. The diamond with a level of 0 is the ultimate symbol of diamond mechanics. If there are three zeros, it means the proportions of the diamonds. Polish) and symmetry are perfect, perfect for diamond turners!
International Gemological Institute IGI (International Gemological Institute)
IGI is a well-known professional appraisal office in Europe and the United States. Currently, there are branches in Antwerp, New York, Bangkok, Mumbai and Tokyo. Each year, IGI has issued 400,000 copies of various identifications or reports. IGI was also the first appraisal unit to engrave the laser number on the waist of the diamond. It first launched an appraisal report on the finished jewelry in 1997, and also established its standard status in the appraisal industry.
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