A model poses with a 12.03 carats cushion-shaped fancy vivid blue diamond mounted on a ring at Sotheby’s auction house in Geneva. The “Blue Moon Diamond” sold for 48.6 million Swiss francs ($48.4 million). Photograph: Denis Balibouse/Reuters

The rare and flawless “Blue Moon Diamond” sold for 48.6 million Swiss francs ($48.4 million) to a Hong Kong buyer on Wednesday, setting a world record(...)

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