The gold hardness of 750 is relatively high, the necklace is not easy to break, and the color is good, and the finished product will look better, but the processing cost is also relatively expensive. If you take it back for thousands of gold, you have to make up the difference in labor costs. The gram price of thousands of gold is higher than that of au750. If you just bought it today, it shouldn't be a problem to take it back for exchange.