How to Polish River Rocks

Customize the size and shape of river rocks in a rock tumbler.
••• river rocks image by MAXFX from

River rocks are easily polished in a standard rock tumbler and are commonly used in indoor and outdoor decorating, as massage stones or in metaphysical crystal healing. River rocks can be purchased online, in various stores worldwide or can be collected by hand along any river. Polishing river rocks takes time, generally more than a month, with the exact time determined by the hardness of the stone. Stones can be altered to personal preference by alternating the size of the abrasive grit and the number and duration of tumbles.

    Mix river rocks, water (level with the top of the rocks) and 4 tbsp. of abrasive grit in the rock tumbler. Turn on and tumble for one week. The size of the grit matters; start with large grits and work your way to finer grits to customize the rocks.

    Remove the rocks and wash them in room-temperature water. Allow them to dry thoroughly as rocks alter in appearance when they are wet.

    Repeat steps 1 and 2 until you attain the desired smoothness and shape. The goal is to have rocks without scratches of any kind so that the polish takes.

    Place smooth, shaped rocks into the tumbler. Add 3 tbsp. pre-polish and water. Tumble for 10 days.

    Remove the river rocks and wash again. Place rocks, water and 2 tbsp. of polish into the tumbler and tumble for two weeks. Remove the rocks and wash again.

    Place the rocks into the tumbler for a final time. Add water and a bar of Ivory soap. Tumble for three hours. Remove and wash the stones. The river rocks are now smooth, shaped, polished and ready for use.

    Things You'll Need

    • Rock tumbler
    • Water
    • Abrasive grit, varying sizes
    • Pre-polish
    • Polish
    • Ivory soap


    • If the noise of the tumbler is bothersome, move it where you cannot hear it like a garage or basement.

      Rock tumblers are available in a kit.


    • Do not put river rocks smaller than ¼ inch in diameter, broken or jagged into the rock tumbler.

      A tumbler barrel should never be more than 2/3 full.

      Rocks that do not take polish were likely either in an overfilled tumbler or must be tumbled with grit again to ensure that they are free from scratches.

Related Articles

Science Tech Rock Tumbler Instructions
Instructions for a Rolling Stones Rock Tumbler
How to Use an NSI Rock Tumbler
How Do I Polish Sliced Agate?
How to Polish Rocks & Gems Without a Rock Tumbler
How to Make Faux Rocks Out of Cardboard Boxes
How to smooth pebbles and stones
Experiments With Coal
How to Cut Agates
What Equipment to Take on a Gem Mining Trip
Difference Between Weathering & Erosion for Kids
How to Hand-Polish Stone
How Are River Rocks Formed?
What Factors Determine the Rate of Weathering?
How to Clean Geodes
How to Stabilize Raw Turquoise
Rock Lessons With Activities for the First Grade
How to Make a Volcano for Kids Using Mud
Rock Hunting In Alabama

Dont Go!

We Have More Great Sciencing Articles!