A perfect 62.30 carat D colour, Flawless, pear-shaped diamond which will lead a Christie's auction of magnificent jewels in Geneva, Switzerland on November 18.
An extraordinary gem of excellent polish and symmetry, according to Christie's, the diamond exemplifies the best criteria of the 4 C's: colour, clarity, cut and carat.
It is reportedly one of the most important D colour Flawless diamonds to be offered at auction in many years - and its esimate is only available on request.
With a beautiful selection of 215 carefully chosen lots, Christie's fall auction of magnificent jewels in Geneva reflects the current demand for fine quality gemstones and signed vintage jewellery, presented with attractive estimates," said Jean-Marc Lunel, Head of the Sale.
"An emphasis has been placed on items with a private provenance, which are fresh to the market and traditionally appeal to both professionals and international private collectors."
The perfect 62.30 carat pearshaped diamond, "is one of the most important D colour, Flawless diamonds to be offered at auction in many years," he said.
Elsewhere, the most sought after coloured diamonds in the sale include a magnificent 65.20 carat fancy intense yellow cushion-shaped diamond pendant (estimated at SFr.850,000-1,250,000) and a rare 4.42 carat fancy intense green square-cut diamond (estimated SFr.680,000-900,000). Each are collectors' gems.
Completely fresh to the market is a superb 3.30 carat fancy intense blue diamond of potentially flawless clarity, set in a twin stone ring together with an important E colour diamond of 3.90 carats (estimated at SFr.500,000-650,000 and a fancy vivid, fancy intense and fancy blue diamond clasp (estimated at SFr.380,000-480,000) - both with a private provenance.
Also featured is the largest recorded 19.13 carat fancy greyish yellowish green "chameleon" briolette-cut diamond in the world, mounted as a pendant (estimated at SFr.420,000-630,000).
Among the sales gemstones is a sensational 7.03 carat oval-shaped Burmese ruby of vibrant red colour set in a diamond cluster ring by Laurence Graff (estimated at SFr.750,000-1,100,000), and an impressive 12.79 carat Colombian emerald and diamond ring (estimated at SFr.400,000-500,000).
Dazzling decorative items lots include a sophisticated onyx and diamond pendant in the unusual shape of a flower vase. The necklace made by Cartier in 1914 is a superb example of the black and white geometric style of early Art Deco creations (estimated at SFr.50,000-65,000).
Purchased at Cartier by the famous art collector Calouste Gulbenkian, who had a passion for jewellery, this pendant (transformed from the original brooch in the 1920s) was owned by another great philanthropist, the English racehorse owner Washington Singer.
Among other jewels dated from the same decade is an exceptional Art Deco diamond sautoir by famous American jeweller JE Caldwell, which is featured with an estimate of SFr.480,000-580,000.
The Christie's Geneva sale will be held at the Four Seasons Hotel des Bergues in Geneva. The auction itself will go ahead on November 18, with pre-sale viewings between Saturday 14 and Tuesday 17.