This varies from person to person. I want to express my opinion. I think wedding rings are only recommended to buy K gold, and nothing else is recommended. First of all, let's talk about 18k gold: even if it contains 75% gold, it is hard and more resistant to making wedding rings, and it is usually inlaid with gems. Compared with K gold, it is stronger and has more shapes because of its hardness. Besides, there are many colors you want to match. In fact, there is 14k 9k gold, but I don't think you are interested ... At the same time, the function of 18k gold is almost the same as pure gold. Generally, businesses that recycle pure gold will also recycle 18k. And it is cheaper when you buy it. It shows that the metal containing more than 99% gold is too soft. If you look closely, you will find that there is absolutely no pure gold inlay in the store. Even if there is that gem, it is worthless. There are too many examples of pure gold inlaid gems falling off. I repeat, even if nothing is inserted, platinum itself is easily deformed: I dare not say whether it is valuable or not, but it is really not suitable for wearing. Although it is harder than pure gold, it is still soft. I once took out a platinum ring from liquid nitrogen by hand. The key is that it can be broken ... 18k will never happen. If you wear it for a year, there will be many scratches on it, which will become much more obviously polluted than before. On the right is the platinum on the left. 18k Feel for yourself … Finally: Just buy a wedding ring, and don't think about preserving the value. Well, let alone whether you will sell it one day. Let's just say the wedding ring is a few grams smaller. Even if gold rises from 280 to 820, how much money can you make? Therefore, 18k is recommended, which is more valuable and durable than others. After all, it is a wedding ring and a witness. The higher the durability, the better.