Ctf stands for Chow Tai Fook, thousands of gold stands for gold content, and FC stands for manufacturer. Necklace is one of the ornaments of human body and the earliest jewelry. Some necklaces not only have decorative functions, but also have special display functions, such as Catholic cross chains and Buddhist prayer beads. Since ancient times, in order to beautify the human body and the environment, people have made necklaces with different styles, characteristics and styles to meet the aesthetic needs of people with different skin colors, nationalities and aesthetics. This paper introduces the style of necklace from two aspects: material and style. As far as materials are concerned, there are several kinds of necklaces in the jewelry market, such as gold, silver and jewelry.