circa 2000-1500 B.C.
the flat plain ring with a narrow slit cut at an oblique angle through the side, the surface smoothly polished and squared at the edges, the translucent olive green stone with cloudy tan altered areas at the outer rim and widely scattered ‘root marks’.
Diameter 5 1⁄8 inches (13 cm)
Compare the plain jade ring with a narrow slit excavated from Wangjiafenshan, Ningxiang, Hunan province, now in the Hunan Provincial Museum, illustrated by Gu (ed.), Zhongguo chutu yuqi quanji (Complete Collection of Jades Unearthed in China), Vol. 10, Hubei, Hunan, Beijing, 2005, p. 162.
新石器時代 玉玦 徑13厘米