The Winston Red Diamond is 2.33 carats and the world’s fifth-largest confirmed red diamond. CREDIT: Photo by Robert Weldon, courtesy of Ronald Winston. Get the Popular Science daily newsletter💡 ...
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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