A rare crimson red diamond unveiled at Smithsonian Natural History Museum

Finally, on Tuesday local time, the Smithsonian National Museum of Natural History in the U.S. unveiled the Winston Red Diamond, a 2.33-carat gem recognized as one of the world's largest Fancy Red diamonds.

Donated by Ronald Winston, son of renowned jeweler Harry Winston, the rare diamond is now on public display in the museum's Harry Winston Gallery alongside 40 other colorful diamonds.

Fancy red diamonds are exceptionally rare, with researchers estimating their occurrence is fewer than one in 25 million diamonds.

The deep crimson hue results from unique alterations in its crystal structure under extreme pressure and temperature conditions.