The Azure Blue is one of two important blue diamonds being offered at Christie’s. The second is a 5.04-carat fancy vivid blue diamond Its estimate is $6.5 to $8.5 million ...
The 9.51-carat “Mellon Blue” diamond sold for $25.5 million at Christie’s Geneva Magnificent Jewels auction, held Tuesday at the Four Seasons Hotel des Bergues. The fancy vivid blue pear-shaped ...
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