Very fine 10.96 carats Kashmir sapphire and diamond ring. Estimate 1,070,000 — 1,560,000 CHF (1,009,435 - 1,471,700 EUR). Photo  Sotheby's

The cushion-shaped sapphire weighing 10.96 carats, claw-set between demi-lune diamond shoulders, size 52.

Accompanied by SSEF report no. 68900 and Gübelin report no. 13067099, each stating that the sapphire is of Kashmir origin, with no indications of heating, each with an appendix letter, the SSEF report in a hardbound case.

"The velvety blue of this sapphire is due to very fine and subtle inclusions and a combination of well-balanced trace elements in the gemstone, typical and characteristic for the finest sapphires of Kashmir," SSEF appendix letter, 26 June 2013. 

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