The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green. But ...
Both rubies and emeralds are minerals, which is a type of rock with a consistent chemical composition and a highly ordered structure at the atomic level. When this highly ordered structure extends ...
With a theory developed by physicists in the 1920s called crystal field theory, scientists can explain why rubies and emeralds have the colors they do. Crystal field theory makes predictions about ...