Never buy it. Not to mention the high price and poor quality. The hard gold they sell is said to be four times harder than ordinary gold and more fragile than ordinary gold. There is no warranty. If you can't change the same model, you have to increase the price by 25% if you change other models, otherwise you will have to charge 25% of the labor, which is strongly not recommended. What a pit! In addition, it does not emphasize weight, and its value is difficult to measure.