Many people think a stream- or beach-rounded stone can go straight to fine grit then to polish. Most of the time this is NOT true. Natural rounded stones often have a weathering rind or bruising that must be abraded away before they will take a polish.
How to Tumble and Polish Stream- or Beach-Rounded Rough
Education : How many of you tumble your own rocks?
Making Tumbled Glass in a Rock Tumbler
How to Polish Stones: 13 Steps (with Pictures) - wikiHow
Süttői díszkavics szegélyezéshez
Tumble finishing - Wikipedia
Süttői díszkavics szegélyezéshez
Why River Rocks are Smooth: The Science, Explained – Rockhound Resource
Learn the Secrets of Rock Tumbling and Rock Polishing