One cabochon colour-changing star sapphire, 41.35 carats
Diamonds in the surround, totalling approximately 3.40 carats
Platinum
Size 6½
(41.35-carat Colour-changing Star Sapphire) GRS report, numbered GRS2014-018364, dated 7 January 2014, Sri Lanka, no indication of thermal treatment.
附 GRS 證書
Catalogue Essay
Asterism, a six-rayed star, happens to a sapphire when there are tiny needle-like rutile inclusions growing in three orderly directions intersecting each other, and yet it is more tricky to a gem-quality star sapphire when it requires just enough quantity of rutile needles to produce the star effect but not blocking the visual transparency. The present colour-changing star sapphire is even rarer that it displays two amazing optical phenomena simultaneously, showing a complete change of body colour from intense blue to purple under different light sources, while displaying a distinct asterism atop its nicely domed surface.
607
A Colour-changing Star Sapphire and Diamond Ring
Size 6½
Estimate HK$700,000 - 850,000 $90,000-110,000
Contact Specialist Terry Chu
Head of Jewellery, Asia, Senior Director
+852 2318 2038