A green and russet jade incense burner and cover, 18th century. Photo Bonhams

Decorated with taotie masks and other archaistic motifs delicately carved in shallow relief, the ruyi-head loop handles with a knot linking them to the rim; the domed cover with reticulated dragon finial, all on a detachable base; the stone of a semi-translucent, pale green tone with some russet and speckled black and white inclusions. 18cm (7 1/8in) wide (3). Estimate: £20,000 - 25,000 (HK$ 240,000 - 300,000) (€25,000 - 31,000) 

Bonhams. 5 Sep 2012 11 a.m. London, Knightsbridge. Chinese & other Asian Works of Art