A gourd-shaped chrysoprase gourd snuff bottle. Photo Bonhams

The ovoid pebble well-hollowed on the interior through a small aperture at the top, the walls carved as overlapping leaves covering most of the fruit with a hobnail rind, the matrix of mottled rice-straw hue with icy white inclusions and natural fissure lines. 2 1/8in (5.5cm) high - Estimate: US$800 - 1,200. Unsold

Bonhams. Asian Works of Art, 21 Dec 2011, California, San Francisco www.bonhams.com