Lot 221. A 4.05 carat fancy deep blue diamond ring. Estimate CHF 5,000,000 - CHF 7,000,000 (USD 4,976,816 - USD 6,967,542). © Christie's Images Ltd 2017

Set with a fancy deep blue square cut-cornered diamond, weighing approximately 4.05 carats, to the plain hoop, ring size 6 ¼, mounted in platinum.

Accompanied by report no. 5171955696 dated 14 October 2016 from the GIA Gemological Institute of America stating that the diamond is Fancy Deep Blue colour, VS1 clarity.

Christie's. Magnificent Jewels, 17 May 2017, Geneva