A sapphire and diamond ring . Photo Christie's Image Ltd 2013

Set with a sugarloaf cabochon sapphire, weighing approximately 18.19 carats, to the tapered baguette-cut diamond surround and shoulders, mounted in platinum, ring size 6. Estimate CHF15,000 – CHF25,000

Accompanied by report no. 92042410 dated 5 March 2007 from the AGTA Gemological Testing Center stating that the sapphire shows no indications of heating

Please note that the report is more than 5 years old and might require an update

Christie's. MAGNIFICENT JEWELS. 15 May 2013. Geneva