The National Geographic World’s Greatest Rock Tumbler Refill Kit includes an astounding 5 pounds of unpolished rocks and gemstones, along with everything you need to make the stones shine! This kit includes: 2 pounds of our gemstone mix, 1 pound of agate mix, 1 pound of Madagascar mix, one pound of jasper mix, 5 jewelry settings, 20 packets of rock polishing grit, and detailed instructions and Learning Guide.

This is the ultimate rock tumbler refill kit for tumbling enthusiasts! You receive an incredible array of stones including agates, jasper, and more. The gemstone mix includes aventurine, amethyst, sodalite, and tiger’s eye, and the Madagascar mix contains rose quartz, labradorite, and indigo gabbro. This truly is a one-stop refill kit, packed with a wide-ranging variety of rocks and gemstones! Plus, the 20 polishing grit packets allow for five complete rock polishing cycles with any rock tumbler.

A handy storage pouch is also included so you can keep all your favorite specimens together in one place, and the detailed Learning Guide provides tumbling instructions along with fascinating facts about all the stones in the kit.

We make the highest quality hands-on science toys, and all products are backed by exceptional service. With a mission to inspire people to care about the planet, the National Geographic Society is one of the world's largest nonprofit scientific and educational organizations.