Of geometric design, set with a cushion-shaped sapphire weighing 10.91 carats between baguette diamond shoulders, the mount further highlighted with brilliant-cut diamonds and calibré-cut sapphires, size 58. 

Accompanied by SSEF report no. 91546 and Gübelin report no. 16120081, each stating that the sapphire is of Kashmir origin, with no indications of heating.

Sotheby's. Magnificent Jewels and Noble Jewels, Sessions 1 and 2, Genève, 16 mai 2017, 10:30 AM