Lot 2443. A unique diamond necklace suspending a pear-shaped rose-cut D colour, Internally Flawless, Type IIa diamond of 18.47 carats. Estimate HKD 8,000,000 - HKD 12,000,000 (US$1,000,000-1,500,000). Price realised HKD 10,180,000 / US$ 1,307,112 / £ 901,948 / € 1,065,846 to an Asian private. Photo: Christie's Images Ltd 2010

Suspending a pear-shaped rose-cut diamond weighing 18.47 carats, accented by a rose-cut diamond spacer, surmounted by a lozenge-shaped diamond weighing 6.11 carats, to the fine neckchain with collet-set diamond detail, mounted in 18k white gold, 40.5 cm long.

Accompanied by report no. 0911023 dated 12 November 2009 from the Gübelin Gemmological Laboratory stating that the 18.47 carat diamond is D colour, internally flawless clarity; also accompanied by an appendix and a note stating that this diamond is classified as Type IIa (a chemically very pure type of natural diamond, with no measurable traces of nitrogen). It possesses a purity of colour and degree of transparency which are particular to the finest of natural colour type IIa diamonds. Diamonds of this type and size, exhibiting a superior quality, are very rare. Such diamonds have been unearthed from only a limited number of sources around the world (e.g. South Africa, Brazil and India).

Report no. 1112300899 dated 27 October 2009 from the Gemological Institute of America stating that the 6.11 carat diamond is D colour, internally flawless clarity, with excellent polish.

Christie's. Jewels: The Hong Kong Sale, 1 June 2010, Hong Kong