Pink diamond expected to fetch more than £20m at Hong Kong auction

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The 2nd largest, internally flawless “fancy vivid pink” diamond ever to look astatine auction is expected to merchantability for much than £20m erstwhile it goes nether the hammer astatine Sotheby’s successful Hong Kong connected Friday.

The 11.15-carat, cushion-shaped diamond, known arsenic the Williamson Pink Star, is named aft 2 different immense pinkish diamonds: the 59.60-carat, mixed-cut, oval Pink Star diamond that sold for a grounds $71.2m astatine auction successful 2017, and the Williamson stone, a 23.60-carat diamond fixed to the precocious Queen Elizabeth II arsenic a wedding acquisition by the Canadian geologist and ardent royalist John Thorburn Williamson successful 1947.

Mounted arsenic a floral brooch designed by Frederick Mew of Cartier successful 1953, the Williamson is said to person been a favourite of the Queen who wore it connected galore occasions during her reign, including the metallic jubilee.

Williamson owned the Mwadui excavation successful Tanzania wherever the Williamson chromatic and the Pink Star were discovered.

Wenhao Yu, the seat of jewellery and watches astatine Sotheby’s Asia, said: “The find of a gem-quality pinkish diamond of immoderate size is an highly uncommon occurrence, thing that – with the caller closure of the Argyle excavation – seemed, until recently, highly improbable.”

Argyle, a Rio Tinto-owned diamond excavation successful the distant northbound of Western Australia, was closed successful 2020 aft 37 years of operation, during which it produced much than 865m carats of unsmooth diamonds.

The Williamson Pink Star is 1  of lone  2  internally flawless ‘fancy vivid pink’ diamonds implicit    10 carats to look  astatine  auction.
The Williamson Pink Star is 1 of lone 2 internally flawless ‘fancy vivid pink’ diamonds implicit 10 carats to look astatine auction. Photograph: Tristan Fewings/Getty Images for Sotheby’s

“Driven by a constricted proviso and rising demand, prices for top-quality ample pinkish diamonds implicit 5 carats person accrued exponentially implicit the past decade, serendipitously mounting the country for the quality present of this one-of-a-kind stone,” Yu said.

Pink diamonds are peculiarly uncommon among coloured diamonds and nary 1 rather knows precisely however they go pinkish geologically.

“While nitrogen and boron are liable for the vivid hues of yellowish and bluish diamonds, respectively, determination is nary grounds that pinkish diamonds person their colour from hint elements,” Sotheby’s said.

“Rather, the crystal operation of the chromatic selectively absorbs airy arsenic a effect of an idiosyncratic lattice defect which results successful an antithetic statement of atoms successful the crystal. These blessed anomalies occasionally origin pinkish graining successful the diamond crystal – a perfectly superb show of imperfection.”