KoolStone C1 Rock Tumbler Kit — 2.5lb Capacity, 3-Speed, 9-Day Timer, Quiet

A complete, beginner-friendly rock tumbling kit

The KoolStone C1 Rock Tumbler Kit brings a classic, reliable solution for turning rough stones into polished gems. With a 2.5lb capacity, you can tumble more rocks per cycle, making family projects and hobby sessions both satisfying and productive. The rubber barrel design helps minimize noise, so you can enjoy quiet sessions at home without sacrificing performance. The result is a smooth, even polish that invites you to try another batch, row by row.

Designed with user control in mind, the C1 offers 3-speed controls for more precise tumbling and a 9-day timer with automatic shutoff and a memory function. This makes it easier to hone your settings across sessions and repeat favorable results, whether you’re experimenting with different grit sequences or aiming for consistent finishes on multiple stones.

What you get in the box

• Rock tumbler with a 2.5lb rubber barrel
• 1 lb of rough gemstones representing 9 types
• 3 belts and 4 polishing grits with ceramic media
• Sifter, jewelry fastenings, and an illustrated tutorial guide

For longer use and better results, KoolStone suggests pairing the kit with the 4lb Professional Polishing Grit set (sold separately). The package is designed to be ready for immediate tumbling, so you can start a new project as soon as you unbox it.

Smart design, clear guidance, and reliable support

• Significant noise reduction thanks to the rubber barrel, making home tumbling more comfortable
• Clear display and memory-enabled timer simplify planning and repeat cycles
• Comprehensive accessory kit supports a complete learning curve from rough stone to polished gem

Warranty and getting started

Your purchase is backed by an official KoolStone warranty with a one-year coverage and a 90-day risk-free trial. This adds assurance as you begin your tumbling journey, with help available if you have questions about setup or your first cycles.

Getting started is straightforward: unpack, load stones and polishing media, set your preferred speed and timer, and begin a cycle. With the included guide and examples, you can easily refine the process over time and enjoy the tactile satisfaction of polished results.