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Remember that your cave has a river running through it, so it could have any gems that would normally be found in river gravel (alluvial deposits).'
As far as the cave itself, consider its geology. Your typical cave is limestone, so any gems found in it would be those which could be found in limestone. You might want to do a bit of searching to find out what gems have been found in existing caves.
If you can work the quartz in there (my resident geologist isn't available, by the way, so I'm not sure if the quartz is possible) remember that it comes in many colors. However, most of them aren't particularly valuable, and few large pieces are gem quality.
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