The gold content is 66%. Jewelry made of precious metals such as gold and silver needs to be marked with corresponding components and colors on the surface. The necklace says 66%, which means that the gold content of this necklace is 66%, not pure gold. Necklace is a chain jewelry made of gold, silver and jewelry. It is one of the ornaments of human body and the earliest jewelry. In addition to decorative functions, some necklaces also have special display functions.