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I used to have, and I'm sure they still make them, a small rock tumbler. It looked like the back end of a cement truck. You put the stones you want to polish into the barrel, along with some water and a packet of abrasive sand. When you turn it on it starts to revolve and tumbles the stones with the abrasive and polishes them. It took several weeks for the stones to be completely smooth and shiny but it was worth the wait.

You can pick one up at any educational toy store. Or if you are handy, I'm sure you could even build one for yourself.

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17y ago

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