TWO JADE BI DISCS

TWO JADE BI DISCS
NORTHWEST CHINA, 2ND MILLENNIUM BC
Each disc has a central aperture drilled from one side. Both are carved from semi-translucent olive-green stone altered to brown. The larger disc has a cutting mark and accretions on one side.
The larger, 5 5/8 in. (14.2 cm.) diam., cloth box