3 - Figure d'homme debout en costume du XVIIe siècle appuyé sur une épée, vers 1790-1792, Paris, Ecole nationae supérieure des beaux-arts, (c)DR

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Exceptional Sapphire and Diamond Ring. Photo Sotheby's

Centring on a cushion-shaped sapphire weighing 20.04 carats, surrounded by brilliant-cut diamonds, the triple-split mount set throughout with brilliant-cut diamonds, the diamonds together weighing approximately 11.00 carats, mounted in 18 karat white gold. Ring size: 4½. Estimation 12,000,000 — 17,000,000 HKD

Accompanied by AGL, Gübelin and SSEF reports numbered CS 58712, 13111065 and 72489, dated 14 January 2014, 5 December 2013 and 5 February 2014, stating that the sapphire is natural, of Kashmir origin, with no indications of heating. Gübelin Appendix further states that this sapphire "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."

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 07 avr. 2014 - www.sothebys.com