Rare Blue-Green Diamond Resells for $17.3 Million, Double Its 2014 Price

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Ocean Dream, a rare 5.50-carat blue-green diamond, was auctioned at Christie's in Geneva for $17.3 million. The stone had originally sold in 2014 for roughly $8.5 million, so its price has roughly doubled. Its unusual colour is attributed to natural radiation exposure during its formation deep in the earth. The diamond was once displayed at the Smithsonian National Museum of Natural History in 2003.

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