According to the data of Economic Reference Network, BOC Gold adopts the international appraisal standard, that is, 99.99%, which is high-purity gold. Bank of China Gold Bank is a gold company under the People's Bank of China, which controls the sale of low-priced and high-purity gold in China. The full name of BOC Gold Bank is BOC Gold Bank Co., Ltd. With the approval of the central bank, BOC Gold Bank set up a gold-lettered signboard for Expo sales. Relying on the three operation bases of Beijing, Shanghai and Shenzhen, it has formed a comprehensive gold and jewelry service platform integrating brand, product, marketing and operation management. It operates nearly 100 jewelry stores, and its brands include Bank of China Gold Bank, TEMIX Mei Tian Diamond and QBT Cupid Diamond.