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Wittelsbach-Graff Diamond: $109.2 million (£85.7m)
©Courtesy Graff
Jeweller Laurence Graff bought the Wittelsbach-Graff Diamond at auction in 2008 for $24.3 million. Graff made some controversial changes to the gemstone, recutting it to remove damage and enhance its distinctive colour. Although the diamond lost 4.52 carats in the process, it now has a rating of Internally flawless (IF), meaning its value has increased.
The diamond was sold to the former Emir of Qatar, Hamad bin Khalifa, for at least $80 million in 2011, which is $109.2 million (£85.7m) in today's money.
The diamond was sold to the former Emir of Qatar, Hamad bin Khalifa, for at least $80 million in 2011, which is $109.2 million (£85.7m) in today's money.
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