When old gold ornaments are exchanged for new gold ornaments, the processing fee per gram is10-20 yuan. The excess is charged at the selling price of gold. For example, if you have 10g of old gold, you can exchange it for 1 1g of new gold. Excess 1g gold is purchased at the selling price of gold in the store, and no processing fee is charged. If the store charges you 1 gram of gold processing fee on the basis of the selling price of gold, it is a secondary fee, and you can refuse. The exchange of old gold ornaments and new gold ornaments has loss conversion. The old gold jewelry bought in the store needs to be reprocessed, and there is a certain loss during the processing. Generally, the maximum loss is set within 5%. For example, if the old gold jewelry weighing 10 gram loses 5%, it will only have 9.5 grams of gold. If you want to lose 0.5 grams of gold, then the loss of 2% is 9.8 grams of gold. You only need to lose 0.2 grams of gold. I hope our answer can help you.