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Archduke Joseph Diamond: $28.8 million (£22.6m)
©Courtesy Christie's
This exquisite antique cushion-shaped diamond is a whopping 76.02 carats. Discovered in the same Indian mine as the much-admired Koh-i-Noor Diamond, the jewel is named after its first owner, Archduke Joseph August of Austria.
Now part of a private collection, it sold for $21.5 million at Christie's Geneva in 2012. In today's money, that's a hefty $28.8 million (£22.6m).
Now part of a private collection, it sold for $21.5 million at Christie's Geneva in 2012. In today's money, that's a hefty $28.8 million (£22.6m).
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