A green 'Duan' inkstone, Song Dynasty. Photo Sotheby's

of egg-shaped outline, the gently bulging grinding surface sloping downwards to form the curved water trough, the slightly concaved underside with a notch at one end, the stone of a variegated gray-green color. Length 5 1/2 in., 14 cm. Estimate 10,000 — 15,000 USD

Sotheby's. FINE CHINESE CERAMICS & WORKS OF ART. 18 MARS 2014 - 19 MARS 2014. NEW YORK -www.sothebys.com