IGI. Zhou Shengsheng attaches great importance to brand image, and customers also have high requirements for quality. Therefore, the diamonds selected by Zhou Shengsheng will carry IGI certificates to distinguish them from popular brands. Moreover, all their love for diamonds is eight hearts and eight arrows. IGI laboratory is the most authoritative laboratory, which first issued the appraisal standard with eight hearts and eight arrows, so it used the certificate customized by IGI. GIA certificate has a sense of standardization like a water flow line. From the page of the certificate, the gems of celebrities and the goods of street shops all use the same plate making and preset. There is no way to distinguish the different issuing places of GIA branch certificates. In other words, American Gemological Institute meets the consumption needs of people in modern industrialized sectors. GIA doesn't do identification. Generally speaking, brands that are particularly confident in diamond cutting will use IGI certificates.