1, oily, is a very important phenomenon in jadeite original stone shell, which is the result of light diffusion on sand layer. The so-called oiliness means that it looks soft and moist to the naked eye, but it is not real oil.

2. As long as there is a rough stone with a shell, no matter whether the shell is black, white or yellow, it may exist, and the oiliness of the black shell is particularly obvious.

3, oily, simply put, is that the skin of the jadeite original stone "does not absorb water", that is, the original stone is taken out in water, and the moisture on the surface of the skin is quickly concentrated, exposing the skin.

4, generally speaking, mainly bright, black goods are black and bright, the rest of the skin color is bright, like a layer of oil, of course, this is naturally formed, not man-made.

5. Oiliness is the embodiment of the material from the inside out, and it is an attribute of the material itself. The reason for its formation is related to the arrangement of crystals.

6. Look at the uniformity of sand turning, and the crystal structure is delicate, not the meat is thick and the crystal particles are large.