The Mellon Blue Diamond is a famous gem weighing 9.51 carats with a Fancy Vivid Blue color. It was sold for over $25.5 million USD, becoming the third most expensive vivid blue diamond ever sold by Christie's. The diamond is prized for its exceptional color and purity and once belonged to the renowned American philanthropist and art collector, Rachel Lambert Mellon (known as Bunny Mellon).
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