Lot 70. Star sapphire and diamond ring. Estimate HK$2,000,000 - 3,000,000 (US$256,000 - 385,000). © Tiancheng International
Centring on an oval cabochon star sapphire weighing 38.48 carats, to a stylised basket decorated with marquise-shaped and brilliant-cut diamonds together weighing approximately 6.25 carats, mounted in 18 karat white gold. Ring size: 5¾.
Accompanied by C. Dunaigre report numbered CDC1205138, dated 9 June 2012, stating that the 38.49 carat star sapphire is natural, Intense Blue colour, of Burmese origin, with no indications of heating; with comments, stating that 'This sapphire displays a sharp and well centered asterism (star effect).'; and 'A Burmese star sapphire of this size and quality is rare.'; along with an addendum, stating that 'The beautiful Burmese Star sapphire described ... displays an intense and homogenous blue body colour in addition to a remarkable transparency rarely encountered in star sapphires from Burma (Myanmar). Furthermore, the asterism (star effect) is very pronounced and well centered. A Burmese Star sapphire of such a size and excellent quality is rare.';
GRS report numbered GRS2008-091206, dated 10 September 2008, stating that the 38.48 carat star sapphire is natural, Blue colour, of Burmese origin, with no indication of thermal treatment;
six GIA reports, stating that the 1.97 carat diamonds ranging from 0.38 to 0.30 carat are D colour, Internally Flawless to VVS2 clarity, all with Excellent Polish.