IGI is an international gemological institute. Founded in Antwerp, Belgium, it only did private diamond appraisal for a few Belgian diamond families. 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.