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

Centering upon a collet-set cushion-shaped sapphire in a circular-cut diamond frame, to the shield-shaped calibré-cut sapphire and circular-cut diamond surround and shoulders, mounted in platinum, ring size 6½. Estimate CHF25,000 – CHF35,000

Accompanied by report no. 11080042 dated 14 September 2011 from the Gübelin GemLab stating that the sapphire is of Burmese origin, with no indications of heating

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