The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...

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 ...

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.

But how can one element – chromium – create the red color of a ruby and green color of an emerald? Rubies and emeralds have the colors they do because, like many substances, they absorb some ...