It’s not exactly the rarest hair color and eye color combination. So which combo is the least common? To understand that, we need to understand the science. As Julie Kaplan, MD, a physician at ...

Kai Kupferschmidt is a science journalist and author of “Blue: In Search of Nature’s Rarest Color.” “If you talk to a chemist or a physicist, they will not even call it blue,” he said.

Arizona is known for having gorgeous sunsets because of the climate conditions. But do you know what the rarest sunset colors are? Here's the science.

The rarest type of sunset is one with violet or ... As the light scatters, the color of the light is affected by the size of the particle and the wavelength of light. Blue and violet are scattered ...

As our host puts it, you "never see these." Additionally, this New Yorker boasts what has to be the rarest exterior color offered in 1961. It's called Dubonnet, and I'm finding it very hard to ...

Estimated at approximately $20 million, the diamond is one of the rarest in the world ... Mediterranean Blue exhibits the highest possible color grading for a blue diamond. Its cushion-shaped ...