Best tool for manually "rounding" (finishing) the edges of cut tumbled stone on a counter.?

Question:I've heard of a grind stone, do they work good. i need to finish the edges (round them a bit), so the skirt cut can be put on. Any suggestions?

Answers:
There is a hand held grind stone that terrazzo finishers use. It looks like a big hockey puck with a knob on top. Try that