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  • (Photo courtesy: Sotheby’s)
  • (Photo courtesy: Sotheby’s)

The Largest Blue Diamond Appears at Sotheby’s Auction

The upcoming Sotheby’s Hong Kong Luxury Week will show the best of what Sotheby’s has to offer── the De Beers Cullinan Blue. The unrivalled 15.10-carat step-cut fancy vivid blue diamond will appear in a single-lot auction in late April after going on display in New York, London, Dubai, Singapore, Shanghai, Beijing, Shenzhen, and Taipei.

The De Beers Cullinan Blue, uncovered at the Cullinan Mine in South Africa in 2021, one of very few sources for extremely rare blue diamonds, is the largest internally flawless step cut vivid blue diamond that the Gemological Institute of America (GIA) has ever graded. “Blue diamonds of any kind are rare on the market, but this is the rarest of the rare; nothing of remotely similar calibre has appeared at auction in recent years. Hundreds of millions of years in the making, this extraordinary blue diamond is surely one of nature’s finest creations. Now brought to dazzling life by the hand of one of the world’s most skillful cutters, it is the ultimate masterpiece - as rare and desirable as the very greatest works of art,” Patti Wong, Chairman of Sotheby’s Asia told. Whether it will accept cryptocurrency for this auction is unsaid.

Estimated more than US$48 Million (HK$380 Million), the De Beers Cullinan Blue is the largest vivid blue diamond appearing at auction, according to Sotheby’s. Before that, only five blue diamonds weighing over 10 carats have been offered to bidders, one of which is 'The Blue Moon of Josephine’, a 12.03 carat cushion-shaped internally flawless fancy vivid blue diamond sold for US$48.5 million (US$4,028,941 per carat) in 2015 that holds the price-per-carat auction record for any diamond or gemstone.


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