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12 of the world's rarest diamonds available to buy

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The Pink Star diamond

Image courtesy of Sotheby's

The world's largest Internally Flawless Fancy Vivid pink diamond is set to go under the hammer at Sotheby's Hong Kong on April 4 and, with an estimate in excess of $60 million, may become the most expensive diamond ever sold at auction. The Pink Star was cut from a 132.5 carat rough diamond unearthed in Africa by De Beers in 1999 and took two years to cut and polish into a beautiful oval form which highlights the rare internal clarity and chemical purity of the stone. The Pink Star was previously offered for sale at Sotheby's Geneva in 2013, where it reached $83 million, but the buyer defaulted on the payment leaving the stone unsold and the title of most expensive diamond in the hands of the Oppenheimer Blue which went for $57.5 million at Christie's Geneva in 2016.

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