Lot 213. A fine 18.30 carats Kashmir sugarloaf sapphire and diamond ring. Estimate CHF 1,800,000 - CHF 2,000,000 (USD 1,816,364 - USD 2,016,474). Photo Christie's Images Ltd 2016.

Set with a sugarloaf sapphire, weighing approximately 18.30 carats, between tapered baguette-cut diamond shoulders, ring size 6 ½, mounted in platinum and gold.

Accompanied by report no. 87170 dated 15 August 2016 from the SSEF Swiss Gemmological Institute stating that the origin of the sapphire is Kashmir, with no indications of heating, that the colour may also be called 'Royal Blue', an Appendix letter stating that this sapphire 'exhibits a remarkable size and weight (...), combined with an attractive and saturated blue colour and a very fine purity', and a Premium book.

Report no. 16075037 dated 5 August 2016 from the Gübelin GemLab stating that the origin of the sapphire is Kashmir, with no indications of heating, an Appendix letter, and an Information Sheet on 'Unheated sapphires'.

Report no. CS1077284 dated 18 July 2016 from the AGL American Gemological Laboratories stating that the origin of the sapphire is Kashmir, with no gemological evidence of heat and no clarity enhancement.

Christie's. Geneva Magnificent Jewels, 15 November 2016, Geneva