Qijia culture, circa 2500-1500 B.C.
Diameter 11.7 cm
The semi-translucent stone is of a brown-yellow tone with creamy white and brown areas and widely scattered 'root marks', the surface smoothly polished.
Compare the similar jade disc, Sotheby’s, on 1 June - 2 June 2017, Chinese Art, Hongkong, Lot 322.
Compare also the similar jade disc, Lark Mason Associates’ online auction, on April 18th 2017, Asian Works of Art, New York.
References:
Jessica Rawson
'Chinese Jade from the Neolithic to the Qing'
London, 1995.
Section 7, Cong and discs