Would earthlike planets in other solar systems have well-known Earth gemstones such as rubies, emeralds and sapphires?
I'm currently working on a conworld that has never had any contact with Earth, and I'd like to create words for iconic gemstones, such as rubies, emeralds and sapphires.
However, I can't help but wonder: Are these gemstones "universal", or are they unique to Earth?
Is the existence of these minerals linked to unique events in Earth's history, like the evolutionary histories of organisms?
Or is the process behind their formation simple enough that they could emerge just about anywhere where the right elements are present?
I realize that a general answer might not be possible, but even a push in the right direction would be helpful to me.
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