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The diamond is defined as having a “Fancy red” color grade, meaning it’s pure red with not even a hint of brown, purple, or orange. At 2.33 carats, it’s one of the largest Fancy red ...

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 Smithsonian’s National Museum of Natural History has acquired the 2.33-carat "Winston Red Diamond," as part of the “Winston Fancy Color Diamond Collection.” ...

The Winston Red Diamond is 2.33 carats, among the largest to have the “Fancy red” color grade from the Gemological Institute of America. Insiders believe fewer than one in 25 million diamonds ...

The Smithsonian’s National Museum of Natural History will unveil the Winston Red Diamond and Winston Fancy Color Diamond Collection Tuesday, April 1—an extraordinary showcase of some of the world’s ...