We generally use it in the setting of spar with relatively large light transmission, mainly the spar with smooth surface.

The bottom of this stone is almost flat and transparent, so the color is not very strong.

It doesn't look fancy enough and the color is not good.

The back sealing technology is to stick a layer of metal or other materials (such as shells) on the bottom of the spar to make it more colorful.

. .

Nowadays, many high-grade jadeites will open their mouths even if they have a bottom, so that buyers can see it intuitively.

Because the back cover is usually used to block out leisure time, the gem is not perfect. .