1. official website, the Chinese trademark of the State Trademark Office, can inquire about the brand of the flagship store and whether the registered trademark is around 15 years, which can reduce the risk.

2. The purity of gold is 999 or 999.9, which can ensure that the recovery price of gold is not low and the selling price is not too high.

3. Search for the lowest price of gold on the e-commerce platform, and you can issue an invoice. The preservation rate of the margin bracelet reaches 95-85%.

4. Calculate the value-added rate of gold bars or gold jewelry on the trading day, and the ratio of the recovery price on the same day to the purchase price on the same day. The appreciation rate of gold bars is not less than 95%, and the appreciation rate of gold jewelry is not less than 90%, which is the most cost-effective gold.