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‘Williamson Pink Star’ Diamond Sold at New Auction Record

The ‘Williamson Pink Star’, an 11.15-carat fancy vivid pink diamond, sold for HK$453.2 million ($57.7 million) at Sotheby’s Hong Kong auction on 7 October 2022, making it the second most valuable diamond ever sold, and the highest price-per-carat for any diamond or gemstone at auction.


The final result is nearly three times the lot’s original $21 million pre-sale estimate. 


The buyer who is a private client from Florida renamed the stone ‘The Rosenberg Williamson Pink Star’.


Mined at the Williamson mine in Tanzania and cut by Diacore, the internally flawless cushion-cut diamond is the second largest IF fancy vivid pink diamond ever to appear at auction. The largest is the 59.6-carat ‘CTF Pink Star’ Chow Tai Fook paid $71.2 million for in 2017, and it remains the most expensive gem or jewel ever sold at auction.


With a per-carat sale price of roughly $5.2 million, ‘Williamson Pink Star’ now holds the price-per-carat record for any diamond or gemstone sold at auction, effectively doubling the previous record of $2.7 million per carat set by the 18.96-carat ‘Winston Pink Legacy’ at Christie’s in 2018.


Wenhao Yu, chairman of Jewellery and Watches at Sotheby’s Asia said in a statement following the sale: “One of the purest, pinkest of diamonds, ‘The Rosenberg Williamson Pink Star’ now takes its place in the pantheon of world record-breaking gemstones of the rarest kind, as the second highest price achieved for any jewel or gemstone sold at auction. The result today not only attests to the resilient demand for top quality diamonds in Asia, but a heightened awareness of the great scarcity of pink diamonds driven by an ever-limited supply.” (Photo courtesy: Sotheby’s)






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