The colors of rubies and emeralds are so striking that they define shades of red and green — ruby red and emerald green. But have you ever wondered how they get those colors? One feature of ...

The red light is reflected back, so that’s what you see in rubies. In an emerald, even though the chromium is surrounded by ...

Daniel Freedman, University of Wisconsin-Stout (THE CONVERSATION) The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green.

Rubies and emeralds have the colors they do because, like many substances, they absorb some colors of light. Most visible light, like sunlight, is composed of all the colors of the rainbow ...