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

Set with an octagonal-cut sapphire, weighing approximately 11.30 carats, to the tapered baguette-cut diamond ballerina mount, ring size 6. Estimate CHF80,000 – CHF100,000 ($91,792 - $114,740)

Accompanied by report no. 14020097 dated 17 February 2014 from the Gübelin GemLab stating that the sapphire is of Burmese origin, with no indications of heating, and an additional Information Sheet on Unheated sapphires

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