An important and rare Fancy Vivid Blue diamond ring. Photo courtesy of Sotheby’s

Claw-set with a cut-cornered rectangular mixed cut fancy vivid blue diamond weighing 5.04 carats, size 52Estimation 5,100,000 — 5,700,000 CHF 
Accompanied by GIA report no. 1142945155, stating that the diamond is Fancy Vivid Blue, Natural Colour, SI1 Clarity
Of all the colour grades awarded by the GIA to blue diamonds, the highest and most coveted is Fancy Vivid Blue. The diamond offered here exhibits a very attractive shade of blue which will appeal to connoisseurs in this field. 
Sotheby's. Magnificent Jewels. Genève | 13 nov. 2013 - http://www.sothebys.com