Lot 1698. 19.09 carats Sri Lankan 'Royal Blue' Sapphire and Diamond Ring. Estimate 700,000 — 900,000 HKD. Photo Sotheby's.

Of bombé design, set with an oval sapphire weighing 19.09 carats, within a circular-cut diamond surround and pavé-set diamond shoulders, the diamonds weighing approximately 8.40 carats in total, mounted in 18 karat white gold. Ring size: 7½

Accompanied by GRS report numbered GRS2014-080737, dated 21 August 2014, stating that the 19.09 carat sapphire is natural, of Sri Lankan origin, vivid blue (GRS type 'royal blue'), with no indications of thermal treatment. 

Sotheby's. Important Jewels and Jadeite, Hong Kong, 28 Nov 2016, 01:00 PM