Black jadeite, ruby and diamond bangle. photo courtesy Sotheby's

The circular band of black jadeite inset with brilliant-cut diamonds and circular-cut ruby floral motifs, flattened on the inside and rounded on the outside,mounted in 18 karat blackened gold; inner diameter, width and thickness approximately 58.16 x 12.35 x 6.25mm. Estimate 120,000—150,000 HKD. Lot Sold 150,000 HKD

Accompanied by Hong Kong Jade & Stone Laboratory certificate numbered KJ51519, dated 22 July 2010, stating that the jadeite is natural, known in the trade as "A Jade".

Black jadeite, ruby and diamond ring and pair of earrings. photo courtesy Sotheby's

The ring centring on a black oval jadeite cabochon framed by circular-cut rubies; and pair of matching ear studs; mounted in 18 karat white gold. (2); cabochons approximately 19.41 x 17.07 x 9.83mm and 15.56 x 12.57 x 6.25mm respectively. ring size: 5¾. Estimate 80,000—100,000 HKD. Lot Sold 106,250 HKD

Accompanied by Hong Kong Jade & Stone Laboratory certificates numbered SJ14557 and SJ14560, dated 2 August 2010, stating that the jadeites are natural, known in the trade as "A Jade".

Sotheby's. Magnificent Jewels & Jadeite, 06 Oct 10, Hong Kong www.sothebys.com