Gold is a precious metal that can be circulated around the world, but as jewelry, some brands have set some thresholds in the exchange business, with the intention of improving the viscosity of customers. Once the customer has changed the jewelry of other brands, he has to pay the processing fee, fine product fee, depreciation fee and so on. In fact, it is a disguised overlord clause, but because the state has not made any hard and fast rules on this kind of consumption, it can only be based on its own preferences. To put it bluntly, so is gold.