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Q&A Precious Gemstones or Crystals for eyes

In my Fantasy world I thought it would be interesting to have a creature whose eyes would be precious gemstones or crystals. I want to understand how that could be possible, and if any ramification...

5 answers  ·  posted 8y ago by Inbar Rose‭  ·  last activity 8y ago by Inbar Rose‭

Question evolution creature-design mythical-creatures