A sapphire and diamond ring, by Harry Winston. Photo Christie's Image Ltd 2014

Set with a cushion-shaped sapphire, weighing approximately 6.29 carats, to the marquise-shaped and tapered baguette-cut diamond shoulders, mounted in platinum, ring size 6¼. Signed Winston for Harry Winston. Estimate CHF 22,000-28,000

Accompanied by report no. 12027044 dated 5 March 2012 from the Gübelin GemLab 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/