Because the original jade stone can't be seen inside until it is cut. The flashlight shows that green is the green fog on the surface of the original stone. Green fog doesn't necessarily cut green.
Therefore, as the saying goes, you can't watch the color under the lamp. Therefore, a little "green" under the emerald light, especially if the background of the light is black, will aggravate the color, and if the background is green, it will be more beautiful. It is almost invisible in natural light and background, and it is also called "death" in the industry.
If the jadeite raw stone meat is grayish black and the light is green, there may be several situations. The flesh color itself is gray, grayish green and gloomy; There is water in the meat, or there are green flowers in it, which can only be judged by the real thing.