A Chinese dark green and russet jade 'chilong' disc, Bi Possibly Warring States (475-221 BC) The mottled dark green stone with reddish-brown inclusions carved to one side with a sinuous chilong with bifurcated tail, clutching a lingzhi mushroom in its mouth, the reverse polished and finished with a line around the central hole and inside the rim edge. 5.5cm dia.