A yellowish-celadon jade 'human face' ornament, Inner Mongolia, Neolithic period, 3rd - 2nd millennium BC | 新石器時代 公元前三或二世紀 內蒙古青黄玉圓方形人面飾

See a related celadon jade 'human face' ornament, Hongshan culture, excavated from Balinyou Banner, Inner Mongolia, now in the Balinyou Banner Museum, illustrated in The Complete Collection of Jades Unearthed in China, vol. 2: Inner Mongolia, Liaoning, Jilin, Heilongjiang, Beijing, 2005, p. 30, where the triangular-shaped eyes and nose are similarly carved.