A lapis lazuli 'chilong' paperweight, 18th-19th century. Photo Christie's Image Ltd 2014.

The paperweight is of long rectangular form and is carved to the top with a sinuous chilong. The sides and base are decorated with scrolling clouds. The stone is of a vivid blue tone with some lighter inclusions and gold specks. 6 in. (15.3 cm.) long. Estimate £15,000 – £20,000 ($25,320 - $33,760)

Christie's. FINE CHINESE CERAMICS AND WORKS OF ART, 13 May 2014, London, King Street - http://www.christies.com/