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? I am an inorganic chemist ...

There are many examples in nature, including gemstones and paint pigments. ... But how can one element — chromium — create the red color of a ruby and green color of an emerald? Color science.

What do sisters Ruby Devine, Pearl Rosemond and Opal Rosemond have in common besides a gemstone name? Green Hornets girls lacrosse, that’s what. Oldest sister Ruby has returned to her Green ...