What gems could be found in an underground pond or river?
I have the party in an underground cave that has a river in it. I've done a search, but haven't found a good answer.
I've read books where gems fill an underground cave deep in the Earth. I'd like to do something similar, but I want to be a little more realistic. What sort of gems might be found in a cave like this? What could I BS my way through if it's unlikely?
I could certainly do quartz and I think amythest goes with that, but is there anything else?
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