Lot 255. Diamond pendent necklace, Cartier, circa 1930. Estimate: HK$8,800,000 - 12,000,000 (US$1,130,000 - 1,540,000). Sold for HK$10,320,000. © Tiancheng International

The flexible openwork necklace set with old European-cut diamonds, to the front suspending a detachable pendant of a pear-shaped diamond weighing 11.12 carats, surmounted by old European-cut diamonds, the diamonds together weighing approximately 26.40 carats, the necklace can be separated into two segments, each bracelet fitting, mounted in 18 karat white gold, signed, necklace and bracelets lengths approximately 339, 168 and 165mm respectively.

Accompanied by GIA report numbered 5171617292, dated 6 May 2016, stating that the 11.12 carat diamond is D colour, Internally Flawless; along with a diamond type classification report, stating that 'the 11.12 carat Pear Brilliant diamond…has been determined to be a type IIa diamond. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency.'

Tiancheng International. AUTUMN AUCTION 2017 - JEWELLERY AND JADEITE