The second largest, internally flawless “fancy vivid pink” diamond ever to appear at auction is expected to sell for more than £20m when it goes under the hammer at Sotheby’s in Hong Kong on Friday.
The 11.15-carat, cushion-shaped diamond, known as the Williamson Pink Star, is named after two other huge pink diamonds: the 59.60-carat, mixed-cut, oval Pink Star diamond that sold for a record $71.2m at auction in 2017, and the Williamson stone, a 23.60-carat diamond given to the late Queen Elizabeth II as a wedding gift by the Canadian geologist and ardent royalist John Thorburn Williamson in 1947.
