1. First, you can take the bracelet to a regular jewelry store or a gold and silver jewelry testing institution for testing to confirm the material and purity of the bracelet.

2. Secondly, make sure that the bracelet is real gold, but there is no mark. When purchasing, you can contact the merchant or brand customer service, provide the purchase certificate, bracelet photos and other information, and let them mark the brand logo or gold and silver jewelry on the bracelet.

3. Then the merchant or brand customer service can't mark the bracelet, so you can consider giving it to the relevant quality inspection agency for testing and certification to prove its quality and purity.

4. If the final inspection result is false, you can exchange and return it directly to the merchant. The merchant either returns the goods or does not exchange them. If you report to the industrial and commercial bureau, it will be fined.