Lot 39. Jadeite, ruby and diamond ring, Jason Koo. Estimate HK$3,600,000 - 5,600,000 (US$460,000 - 720,000). © Tiancheng International

Centring on an oval jadeite cabochon of very fine translucency and rich emerald green colour, to a stylised mount decorated with circular-cut rubies and brilliant-cut diamonds, the diamonds together weighing approximately 2.15 carats, mounted in 18 karat white and blackened gold, signed. Ring size: 7.

Cabochon measuring approximately 21.73 x 18.10 x 9.48mm.

Accompanied by Hong Kong Jade & Stone Laboratory report numbered KJ96116, dated 28 July 2017, stating that the jadeite is natural, known in the trade as 'A Jade'.

Tiancheng International. Jewellery and Jadeite, 2 Oct · 1 pm