A sapphire and diamond ring

A 69.35 carats Ceylon sapphire and diamond ringEstimate CHF500,000 – CHF600,000 ($543,219 - $651,862). Photo Christie's Image Ltd 2015.

Set with an oval-shaped sapphire, weighing approximately 69.35 carats, in a brilliant-cut diamond cluster, mounted in platinum, ring size 6½ 

Accompanied by report no. 78479 dated 20 February 2015 from the SSEF Swiss Gemmological Institute stating that the sapphire is of Ceylon origin, with no indications of heating 

Christie's. MAGNIFICENT JEWELS, 13 May 2015, Geneva