At present, there are many standards for diamonds, such as 4C standard, with great differences in color, clarity and cut. In the industry, diamonds are all goods from foreign mines and are also monopolized. The closer to the diamond mine, the higher the cost performance. Relatively speaking, this is the way to buy in China. For the brand Betty Wong, it is also an old brand in China, and I have never heard of it. I saw that they said they cooperated with LLD diamonds, which is the largest diamond supplier abroad. The channel should be of high quality, so it can be said that the quality and cost performance are reliable and the reputation is good. LZ should be adopted.