The price of platinum jewelry is generally above one gram in 300 yuan, and the price of palladium jewelry is generally below one gram in 200 yuan, so when you buy it, you will know what gold you are buying by multiplying the number of grams by the unit price. If your price is the price of palladium, it can only show that the salesman fooled you and encouraged you to buy palladium; If the price is platinum, but you get palladium, then it is fraud. You can complain to the Consumers Association and return the goods twice. It is estimated that you met the first situation, and you bought it when you thought it was cheap. So the best solution now is that you add a small amount of money and change your palladium into platinum, and merchants will generally agree. However, when you go, look after the platinum first, and then change it. Don't just say I'm here to exchange, or the salesman will wring water out of his face and make him unhappy with spending money.