"Zhou Li Dazong Bo" records that "jade is a six-vessel, a gift of heaven and earth. Li Jue and Cang Bi, Li Jue and Huang Yan, Dong Li and Qing Gui, Li Nan and Zhang Chi, Li Xi and White Tiger, Bailey and Huang Xuan. "
This mysterious word means black in ancient times.
The shape of jade yellow can be roughly divided into two categories, one is a semi-circular sheet with a slightly missing center and a shape of half. The other is a narrow arc with a radian of about 120 degrees.