A ruby and diamond ring. Photo Christie's Image Ltd 2014.

Set with a cushion-shaped ruby, weighing approximately 10.80 carats, to the pavé-set diamond surround and shoulders, mounted in platinum, ring size 6¼. Estimate CHF440,000 – CHF530,000 ($500,474 - $602,844)

Accompanied by report no. 0606562 dated 6 July 2006 from the Gübelin GemLab stating that the ruby is of Burmese origin, with no indications of heating, and an Appendix stating that the ruby 'possesses a richly saturated and homogeneous colour'

Report no. 73643 dated 24 March 2014 from the SSEF Swiss Gemmological Institute stating that the ruby is of Burmese origin, with no indications of heating.

Provenance: Christie's Dubai, 29 April 2008, lot 144.

Christie's. GENEVA MAGNIFICENT JEWELS. 14 May 2014. Geneva - www.christies.com