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Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structureThere are many examples in nature, including gemstones and paint pigments ... one element—chromium—create the red color of a ruby and green color of an emerald? Rubies and emeralds have ...
(THE CONVERSATION) The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald ... including gemstones and paint pigments.
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