Zhou Dasheng is a famous jewelry brand, and its products are generally of high quality. However, you mentioned that the brand logo on the bracelet is a bit vague, which may be due to the following possible reasons:

1. Logo wear: In daily wear, the logo may be worn due to friction with clothes or other items. In this case, you can consider sending the bracelet to a brand store for repair or replacement.

2. The process problem of the logo itself: If the process of the logo is not fine enough when it is made, or the logo falls off due to some factors during use, it will also lead to the ambiguity of the logo. If this is the case, it is also recommended to send the bracelet to the brand store for processing.

3. Counterfeit products: Although this is not desirable, it cannot be completely ruled out. If you don't buy bracelets from official channels, or the price is much lower than the market price, then you need to pay attention to the possibility of buying counterfeit products. If this is the case, I suggest you contact the seller to return the goods as soon as possible, or go to an authoritative appraisal agency for appraisal.

The above are only possible situations, and the specific reasons need to be judged according to the bracelet in your hand. If you are not sure, I suggest that you send the bracelet to a brand store or an authoritative appraisal agency in Zhou Dasheng for consultation and appraisal.