A sapphire and diamond ring, by Van Cleef & Arpels

A 49.73 carats Ceylon sapphire and diamond ring, by Van Cleef & ArpelsEstimate CHF475,000 – CHF550,000 ($516,058 - $597,540). Photo Christie's Image Ltd 2015.

Set with an oval-shaped sapphire, weighing approximately 49.73 carats, to the brilliant-cut diamond surround and associated hoop, ring size 5. Signed Van Cleef & Arpels (partially illegible) 

Accompanied by report no. 78600 dated 19 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