Lot 33. Fine 22.97 carats Burmese "Cornflower Blue" sapphire and diamond ring. Estimate HK$4,500,000 - 5,500,000 (US$577,000 - 705,000). © Tiancheng International

Centring on a cushion-shaped sapphire weighing 22.97 carats, decorated with brilliant-cut diamonds extending to the shoulders, the diamonds together weighing approximately 8.35 carats, mounted in platinum. Ring size: 5¾

According to Gübelin report numbered 16038098, dated 22 March 2016, stating that the 22.97 carat sapphire is natural, Blue colour, of Burmese origin, with no indications of heating; along with an information sheet, stating that 'The demand for natural, unheated sapphires keeps growing while the supply of such gems remains limited, making large, natural sapphires of gem-quality from all major sources (such as Kashmir, Burma (Myanmar), Sri Lanka, Madagascar and Tanzania) difficult to find.'; 

Lotus premium report numbered 8822-2485, dated 17 February 2017, stating that the 22.97 carat sapphire is natural, Blue colour, of intense saturation and medium-deep tone, of Burmese origin, along with a colour type comment, stating that the lively blue colour of this gem earns it the Lotus "Cornflower Blue" distinction;

SSEF report numbered 85091, dated 20 March 2016, stating that the 22.97 carat sapphire is natural, Blue colour of medium strong saturation, of Burmese origin, with no indications of heating;  

Tiancheng International. HONG KONG SPRING AUCTION, Jewellery and Jadeite, 4 June · 1 pm