If the brand you bought is available in Kunming, you can exchange it directly at the counter with the sales slip you bought at that time, which is free. If you don't have it in Kunming, I suggest you go to a regular jewelry store and find a technician to help you deal with it. There will be a little formality fee, but there will be no problem after the exchange, and there will be no trace after the exchange. He will return the extra gold to you, so you must go to a regular gold shop to exchange it. This shop is easily tampered with. I bought a diamond ring in Baijue the other day, but later I changed it. The service is very good. You can go to the jewelry counters in An Baili, Parkson, New World, Kunbaida, Xintiandi and other big shopping malls, or you can go to Baijue, Xie Ruilin, Chow Tai Fook and other specialty stores to ask. If it really doesn't work, I can take you to Baijue to change it for you. I'm still friends with their boss, so it should be no problem. Of course, I hope you can fix it directly, so as not to worry you so much.