A Superb D Color Flawless and Internally Flawless Clarity Diamond Rivière. Photo courtesy of Christie's

Mounted in platinum, this stunner is designed as a line of 52 brilliant-cut diamonds, five of which are graded as Type IIa, the most chemically pure type of diamonds. In addition, their cut, polish and symmetry are graded as excellent. High estimate: US$9 million

Magnificent Jewels sale at Christie's  Hong Kong. Tuesday 26 November 2013