Generally speaking, Lao Fengxiang, as a formal jewelry brand, should have corresponding quality assurance and certificates for the goods he sells. If there is only one warranty, it can be verified according to the information on the warranty, including brand, product name, material, weight, serial number, etc., to ensure the authenticity and quality of the bracelet.
If you are in doubt about the quality of goods, I suggest you seek the help of a professional third-party appraisal agency to get more accurate judgments and suggestions.