Yes China Gold and Jewelry Association official website inquired that the steel seal of Zhaojinyinlou was "ZJ". "ZJ" stands for the brand logo of Zhaojinyinlou, which is the trademark abbreviation of this jewelry store. When buying jewelry or precious metal products, you can find this seal on the product to confirm the source and authenticity of the product. If you buy the products of Zhaojinyinlou in a specific area or period, you need to check the steel seal or brand logo on the products for confirmation. In order to prevent fake and shoddy products and fraud, when buying jewelry and precious metals, choose a regular reputable jewelry store or dealer.