The Red in Rubies and the Green in Emeralds are Caused by the Same Metal
Some precious gems would be boring if they were pure. Both emeralds and rubies in their pure form are colorless, yet we know rubies by their deep red color and emeralds by their rich green. Both colors are caused by a sm...
https://www.neatorama.com/2025/02/05/The-Red-in-Rubies-and-the-Green-in-Emeralds-are-Caused-by-the-Same-Metal/