The main reason is that the local diamonds are not natural diamonds, but artificial diamonds from Mozambique. Their appearance is similar to real diamonds, but their value is different. At present, the world's largest producer of Mozambican diamonds is the United States, which also has high requirements for diamond quality. Even the key points of diamond identification, such as color, are better than natural diamonds. But this kind of diamond has always been artificial and can be mass-produced.
Non-natural diamonds are worthless, so the local diamonds may still come from a factory in China, and the diamond production level in China is lower than that in the United States. It will turn white after wearing it for a period of time, so China tourists seldom choose to buy it. There are some shortcomings in wearing experience and product preservation. The key is that maybe there will be wholesale in China Commodity City!
Therefore, when you buy something, you must keep your eyes open. Don't buy it just for the sake of cheap. The so-called value for money, simple cheap, may not be able to buy what they really need, only to buy some defective products or synthetic products. Diamonds from Nepal are the best example.