Generally, 10 times magnifying glass is used for identification. However, some professional appraisers will look for the location of jewelry defects under a magnifying glass with a larger magnification, and then use 10 times to find them. If they can't find it, they will be rated as VV S. If you look under the microscope, all diamonds are full of flaws. Hehe ~ ~ In addition, you should also use the colorimetric paper to see which grade the color belongs to. Just one level or above. There is no class d on the market.

The most important thing is cutting. It depends on its cutting surface, the ratio of full drilling depth between the upper lumbar flap surface and the upper lumbar flap surface, and so on.