① Time Certain: Yan-green (green grandmother), Apple green, glass and (translucent, delicate texture), uniform bright, no impurities, crack-free.
② commodity class: green, Yau Ching, micro-transparent,间杂translucent green grandmother Dot Fine veins and Greenfield.
③ ordinary class: beans green, light green, white delicate, slightly transparent. Opaque Fei, Liu Yu-general only ornaments.