Thames & Kosmos Rock Tumbler

Let’s rock and roll! Amp up your rock collection and explore the secrets of geology with the Thames & Kosmos Rock Tumbler! This custom-designed, user-friendly machine allows budding geologists and gem collectors to transform rough stones into beautiful polished rocks while exploring topics like erosion, weathering, and the geological rock cycle.

The kit comes with an assortment of authentic rock samples to get you started — including amethyst, aventurine, rose quartz, and more — as well as four polishing grits. Use the included jewelry settings to create accessories from your specimens. The powerful, long-lasting motor is built with durability in mind: once you’ve polished the included rocks, you can continue your experiments by tumbling rocks, glass, wood, and other materials you collect on your own. The leak-proof, noise-reducing barrel and built-in timer also aid in ease of use.

       The included manual and poster guide children on their rock-polishing adventures, providing usage instructions as well as a wealth of scientific information about different types of rocks, how they are formed, and more.

• Quality, innovative design provides a fresh alternative for a classic science device at a competitive price

• Built-in timer includes different settings, allowing it to run for up to seven days

• Includes jewelry fasteners to transform your rocks into accessories

• 450g capacity (over 1 pound)

• USB-C power supply

Ages 8+

Easy returns
We want you to be thrilled with your purchase! That’s why we offer a 30-day return policy, which means you have 30 days after receiving your item to request a return. Learn more. Shipping
Orders ship USPS Priority Mail or UPS Ground, usually arriving in 3-7 business days. Shipping costs calculated at checkout. Expedited shipping is available for an additional fee. Shipping turnaround time is often within 24 hours. Learn more.