China, Liangzhu Period (3300–2300 BC)
Jade, 2 in. (height)
 
Carved of rounded square section, each corner with two stacked mask motifs. The upper registers are defined by narrow bands incised with parallel lines above circular eyes and a raised horizontal band suggesting a mouth, while the lower masks feature a slightly raised band linking two large oval eyes, each incised with concentric rings above a further horizontal mouth-form.  
 
Cf. Zhejiang Provincial Institute of Cultural Relics and Archaeology. Liangzhu Wenhua Yuqi [Jades of the Liangzhu Culture]. Hong Kong, 1989. Illustrated Liangzhu jade cong, p. 17, no. 18, fig. 3.