Lot 298A. Magnificent 7.74 carats VVS1 Clarity oval fancy deep blue diamond ring. Estimate 8,850,000 — 13,780,000 CHF. Sold for CHF$13,737,500 ($13,706,728). Photo: Sotheby's.

Set with an oval fancy deep blue diamond weighing 7.74 carats, between shield-shaped diamond shoulders, size 51, maker’s mark for Jacques Timey. 

Accompanied by GIA report no. 5171650295, stating that the diamond is Fancy Deep Blue, Natural Colour, VVS1 Clarity.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 16 Nov 2016, 10:30 AM