Thames & Kosmos Rock Tumbler Kit

Budding geologists can explore Earth science and transform rough stones into dazzling polished gems with this custom-designed rock tumbler. The durable, leak-proof barrel features noise-reducing construction and a built-in multi-day timer to make the tumbling process quiet and effortless.

The complete set includes an assortment of natural rough rock specimens like rose quartz, tiger’s eye, and aventurine, alongside four specialized polishing grits. Aspiring gemologists can easily turn their finished shiny treasures into wearable keepsakes using the included jewelry settings.

Powered by a modern USB-C connection, this sturdy tumbling machine provides endless opportunities to polish backyard stones, sea glass, and found minerals. An informative full-color manual and poster guide children through exciting experiments while teaching key lessons about erosion and the geological rock cycle.