A sapphire and diamond 'Trombino' ring, by Bulgari. Photo Christie's Image Ltd 2014.

Set with a cabochon sapphire, to the pavé-set diamond mount with baguette-cut diamond shoulders, mounted in platinum, ring size 5¾. Signed Bulgari. Estimate CHF22,000 – CHF32,000 ($25,092 - $36,497)

Accompanied by report no. 73468 dated 17 March 2014 from the SSEF Swiss Gemmological Institute stating that the sapphire is of Ceylon origin, with no indications of heating 

Christie's. GENEVA MAGNIFICENT JEWELS, 14 May 2014, Geneva - http://www.christies.com/