Kashmir sapphire and diamond ring. Estimate 170,000 — 250,000 CHF (160,378 - 235,849 EUR). Photo  Sotheby's.

The cushion-shaped sapphire weighing 4.21 carats, set within a cluster of marquise-shaped, brilliant- and carré-cut diamonds, the shoulders pavé-set with brilliant-cut diamonds, size 55, sizing band, signed Kat Florence.

Accompanied by SSEF report no. 79747 and Gübelin report no. 14060224, each stating that the sapphire is of Kashmir origin, with no indications of heating.

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 12 mai 2015, 10:30 AM