NEOLITHIC PERIOD, NORTHWEST CHINA, LIANGZHU CULTURE, CIRCA 2500 BC

An altered jade bead similarly carved on one side with a human face is illustrated by J. F. So in Chinese Jade from the Cissy and Robert Tang Collection, Art Museum, The Chinese University of Hong Kong, 2015, p. 48, no. 4b, where it is shown as the central bead of a jade bead necklace, and again in detail, p. 50.