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

Set with an oval-shaped ruby, weighing approximately 7.70 carats, to the brilliant-cut diamond surround and pavé-set shoulders, mounted in gold, ring size 7¼. Estimate CHF600,000 – CHF800,000 ($682,464 - $909,953)

Accompanied by report no. 73472 dated 17 March 2014 from the SSEF Swiss Gemmological Institute stating that the ruby is of Burmese origin, with no indications of heating

Report no. 0608296 dated 5 September 2006 from the Gübelin GemLab stating that the ruby is of Burmese origin, with no indications of heating

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