Fine 13.26 carats Kashmir sapphire ring. Estimate 780,000 — 1,350,000 CHF (735,850 - 1,273,587 EUR). Photo Sotheby's.
Set with a cushion-shaped sapphire weighing 13.26 carats, size 52.
Accompanied by SSEF report no. 72084 and Gübelin report no. 14010024, each stating that the sapphire is of Kashmir origin, with no indications of heating, together with appendix letters describing the quality and rarity of this sapphire.
"The natural sapphire of 13.26 ct described in the above mentioned Gübelin Gem Lab Report possesses a richly saturated and homogeneous colour, combined with a high degree of transparency, and a finely proportioned cut. In addition, this remarkable gemstone has been spared thermal treatment. Such a combination of characteristics is rare in natural Kashmir sapphires of this size," Gübelin appendix letter, 9 January 2014.
Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 12 mai 2015, 10:30 AM