Dear, it is generally not a quality problem, and the merchant will not give you a refund (because he wants to make money).

If you are an old customer, he will give you the price when you return (decrease) or buy (increase).

It doesn't have to be like this. Because there is no reason not to return the goods within 7 days of offline transactions (generally)

Unless you sign a contract with the seller, you can return it at the original price (this exists)

Taobao shop jinshijiao jewellery

I hope it helps you.