Lot 334. Very fine 7.59 carats Kashmir cushion-shaped sapphire and diamond ring. Estimate 735,000 — 980,000 CHF. Lot sold 1,275,000 CHF. Photo: Sotheby's.

Set with a cushion-shaped sapphire weighing 7.59 carats between half-moon diamond shoulders, size 511/2, French assay and indistinct maker's marks. 

Accompanied by SSEF report no. 76097 and Gübelin report no. 14100024, each stating that the sapphire is of Kashmir origin, with no indications of heating, the SSEF report also stating 'royal blue' colour, together with an appendix letter.

Note: 'The described sapphire of 7.597 ct exhibits a highly attractive saturted blue colour combined with an excellent purity... A natural sapphire from Kashmir of this quality is very rare and exceptional'.

Excerpt from the SSEF appendix letter

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 15 Nov 2017, 10:30 AM