Production model. According to relevant public information, Chow Tai Fook Jewellery is one of 78 buyers of DTC, the world's largest rough diamond supplier of British diamond trading company. The brand number is the production model of Chow Tai Fook products, and it is the internal circulation number of their internal design and production until the final listing. Every piece of gold jewelry of Chow Tai Fook brand has a number on it. Chow Tai Fook is a famous brand in China, which not only has a first-class team of designers.