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An impressive diamond ring, by Cartier. photo Bonhams

The step-cut diamond, weighing 27.05 carats, within a six-claw setting, to bullet-shaped diamond shoulders, mounted in platinum, signed 'Cartier Paris' and numbered, French assay marks, ring size 5¼. Sold for HK$2,160,000

Accompanied by a certificate from GIA stating that the 27.05 carats diamond is fancy light yellow, natural colour, VVS2 clarity. Report number 13283032, dated 16th March 2004.

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An emerald and diamond necklace and ring suite, by Cartier. photo Bonhams

The necklace designed as a series of oval-cut emeralds connected by brilliant and shield-shaped diamond circlet links, accompanied by a ring of similar design, mounted in 18k yellow gold, signed 'Cartier Paris', French assay marks, diamonds approximately 40.40 carats total, necklace length 31.4cm, ring size 4½. (2). Sold for HK$456,00

Bonhams. Fine Jewellery and Jadeite and Modern Wristwatches. JW Marriott Hotel Hong Kong, 28 May 2010 to 29 May 2010 www.bonhams.com