Lot 121. 7.10 carats Burmese "Royal Blue" sapphire and diamond ring. Estimate HK$450,000 - 650,000 (US$58,000 - 83,300). Photo Tiancheng International

Centring on an oval sapphire weighing 7.10 carats, framed by brilliant-cut diamonds extending to the shoulders, highlighted by two pear-shaped diamonds, the diamonds together weighing approximately 3.10 carats, mounted in platinum. Ring size: 6. 

Accompanied by GRS report numbered GRS2013-120903, dated 17 December 2013, stating that the 7.10 carat sapphire is natural, Vivid Blue (GRS type "Royal Blue") colour, of Burmese origin, with no indication of thermal treatment;

Gübelin report numbered 13067134, dated 22 June 2013, stating that the 7.10 carat sapphire is natural, Blue colour, of Burmese origin, with no indications of heating; with condition, stating that 'Sapphires which have not been heated are scarce'.

Tiancheng International. MID-SEASON AUCTION, Jewellery and Jadeite, 2 Oct 2017 · 1 pm