A dark green jade bi disc, Late Warring States period / Western Han dynasty | 戰國末 / 西漢 玉穀紋璧

A dark green jade bi disc

Late Warring States period / Western Han dynasty 

戰國末 / 西漢 玉穀紋璧

of circular form pierced with a central aperture, densely carved to both sides with spiral patterns enclosed within line borders, the stone a deep hunter-green streaked with russet and areas of calcification  

Diameter 6½ in., 16.5 cm