Lot 225. A Type IIA cut-cornered rectangular-cut diamond ring weighing approximately 21.01 carats, by Harry Winston. Estimate CHF1,100,000 – CHF1,600,000 ($1,251,287 - $1,820,054). Price realised CHF 1,445,000. © Christie's Image Ltd 2014.

Set with a cut-cornered rectangular-cut diamond, weighing approximately 21.01 carats, to the shield-shaped diamond shoulders, ring size 6 with ring sizer, with French assay mark for platinum. Signed H. Winston for Harry Winston. 

Accompanied by report no. 1152807780 dated 4 December 2013 from the GIA Gemological Institute of America stating that the diamond is D colour, VVS2 clarity, and a Diamond Type Classification letter stating that the diamond is Type IIA

Christie's. GENEVA MAGNIFICENT JEWELS. 14 May 2014. Geneva