2. Diamond jewelry is the only brand on China's jewelry quality list, and it is a well-known brand of Chinese jewelry quality awarded by China Gemstone Association. All its jewels and jade are provided with quality appraisal certificates by China Gemstone Association, and all its pure platinum is provided with quality inspection certificates by the National Nonferrous Metals Research Institute and the National Jewelry Quality Supervision and Inspection Center. It is the largest national jewelry brand in China.