Natural red diamonds are among the rarest gemstones on Earth – and the Winston Red Diamond is a dazzling example. The diamond is defined as having a “Fancy red” color grade, meaning it’s ...

While the latter come in all hues, red seems to be the rarest. Fewer than 30 or so fancy red diamonds larger than one carat exist in the public record, Farfan says.

The Winston Red Diamond and Fancy Color Diamond Collection are the result of 60 years of dedicated acquisitions by Ronald Winston and are now on display in the museum’s Harry Winston Gallery.