IGI is the world's largest jewelry appraisal agency, established in Antwerp, Belgium. At first, it only did private diamond appraisal for several diamond families in Belgium. Later, some high-quality big diamonds were sold to various royal families in Europe, and the name of IGI gradually spread among the royal families. Everyone knows the latter. The royal families in Europe, the Middle East and Asia sent some exquisite jewels that were difficult for ordinary appraisers to Belgium for analysis. Because many of these jewels are inlaid into very complicated crowns, necklaces, rings and so on. They must have rich experience in jewelry appraisal. IGI has gradually developed from only doing diamond appraisal to a global gem institution specializing in providing appraisal for diamonds and high-end jewelry. Due to the particularity of serving people, IGI provides gemological materials, and each certificate follows the manual production procedure of luxury goods, in order to ensure that all aspects of quality match the jewelry. Based on the authoritative research in the field of diamond cutting, IGI developed the world's first complete and comprehensive diamond cutting grade map, which became the embryonic form of the evaluation standard of modern diamond cutting system. In 2007, the chief appraiser of IGI was appointed by the Belgian royal family as the diamond consultant of the Belgian Ministry of Foreign Affairs.

The arrival of modern commercial times has also expanded the scope of IGI services, and IGI certificates have been introduced to more and more consumers by jewelers in the original high-end jewelry circle. However, the IGI certificate still retains the European customization, hand-made, and provides laser lettering photos and exquisite jewelry photos. Nowadays, IGI custom certificates can be seen in many high-end jewelry collections of well-known brands such as Dior and Montblanc. Some stars such as paris hilton also asked IGI to make a certificate for her pink diamond watch. All this is related to the historical origin handed down by IGI. IGI is like a European tailor, providing customized certificates that can reflect the characteristics of products for senior customers. American Gemological Institute is comparable to IGI in the world, and was first established in the United States in the 1930s. But the real large-scale development was in the 1950s, which happened to be the period of great development of American industry and consumption. Therefore, there is an urgent need for a unified standard that can be replicated on a large scale to meet people's large demand for diamonds. Therefore, GIA prospectively summarized the previous experience, put forward the concepts of "clarity" and "color" used by merchants in the industry before, and formally put forward the 4C statement in the 1950s, which played an important role in the rapid development of the jewelry industry in the future, and in the following time, it also introduced many instruments for analyzing gems, which facilitated the insiders to identify gems more efficiently. It can be said that American Gemological Institute was an early promoter of the standardization and popularization of jewelry industry to the public. Its positioning has always been loyal to serving the middle class with the most consumer confidence and the largest number. Therefore, GIA has many fans in the United States, and relatively speaking, high-end jewelry in Europe is used less. What we don't know is that although GIA is a non-profit organization, most of its funds are sponsored by major jewelry companies in the United States. The appearance of its certificate is also in line with the development interests of American jewelers, and it also provides identification certificates for many consumer brands facing the public. For example, the famous American online shop "Blue Nile" focuses on mainstream middle-class men, and basically uses GIA and AGS certificates. When Tiffany took the middle-class route, she used a lot of certificates from American Gemological Institute. With the deviation of self-positioning and brand marketing from GIA mass positioning, I began to use my own certificate.

GIA certificate emphasizes unity. There is a sense of standardization like an assembly line. From the page of the certificate, the star's jewelry and the goods in the street shop all use the same plate making and design. GIA India, GIA America and GIA Hong Kong can't tell their different distribution places. Just like McDonald's and GAP in America, they are the certificates of every policeman, teacher, fisherman and worker in the world. Therefore, it can be said that American Gemological Institute meets the consumption needs of most people in modern industrialization. Diamond High Council-HRD (Belgian Diamond High Council), referred to as HRD. Founded in 1973, it mainly coordinates the activities of Belgian diamond industry. Over the years, HRD has become a recognized official organization in Belgium and internationally, and plays the role of organizer, spokesperson and media in Antwerp diamond industry. At the same time, HRD is also one of the most authoritative diamond inspection, research and certification institutions in the world, and the highest official management institution of the diamond industry in Antwerp, Belgium, the largest diamond trading place in the world. HRD is at the forefront of the research on diamond processing and testing technology and equipment in the world, and it is a pioneer force to commercialize and apply diamond scientific and technological achievements to diamond production. At the same time, HRD laboratory is one of the most well-equipped and technologically advanced diamond laboratories in the world. The diamond appraisal certificate issued by HRD is the guarantee of quality and authority. In the "4C" certification of diamonds (i.e. color, weight, clarity and cut), HRD gives each diamond the highest quality certification and strictly guarantees the uniqueness of each diamond. In diamond cutting, HRD- Antwerp spared no effort to upgrade the cutting to "excellent", which is the highest level of diamond cutting.