Yes According to China Brand Network, as of September 4, 2023, every tag on Leofoo brand gold jewelry will have a QR code and a bar code. You can check the test results of gold jewelry by scanning the QR code through WeChat. Leofoo (full name: Leofoo Jewelry Co., Ltd.) is a company that designs, produces and deals in jewelry. It was established in 2004 and its national headquarters is located in Shenzhen.