Lot 382. A 50.51 carats octagonal step-cut Ceylon sapphire and diamond ring, by Harry Winston. Estimate CHF 1,200,000 - CHF 2,000,000. Price realised CHF 1,872,500. © Christie's Images Ltd 2017

Set with an octagonal step-cut sapphire, weighing approximately 50.51 carats, within a circular-cut diamond surround, ring size 6. Signed Winston for Harry Winston.

Accompanied by report no. 17090196 dated 28 September 2017 from the Gübelin GemLab stating that the origin of the sapphire is Sri Lanka (Ceylon), with no indications of heating, and an Information sheet on 'Unheated sapphires'.

Report no. 94488 dated 14 August 2017 from the SSEF Swiss Gemmological Institute stating that the origin of the sapphire is Ceylon (Sri Lanka), with no indications of heating.

The property of an Italian aristocratic family.