Christie's auctioned the "Archduke Joseph" diamond, which weighs 76.02 carats and was mined at the legendary Indian Golkonda mine, for $21.5 million to a phone bidder, Forbes reported.
It was expected to reach between $15 and 20 million at an auction in Geneva on Nov. 13, 2012. The diamond is about the size of a quail's egg and is named after the Archduke Joseph August of Austria.
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