National Geographic Rock Tumbler Refill Kit – 5 lb. Mix of Rocks for Tumbling and Rough Gemstones – Rock Tumbler Supplies Include Rock Tumbler Grit and Polish Refill, and Unpolished Rocks

Price: $39.99
(as of Dec 30, 2025 06:21:20 UTC – Details)

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Every purchase helps support the global nonprofit National Geographic Society in its work to protect and illuminate our world through exploration, research, and education.

ENORMOUS VARIETY – This rock tumbler refill kit has 5 pounds of unpolished rocks and gemstones consisting of 2 pounds of gemstone mix, 1 pound of agate mix, 1 pound of Madagascar mix, and 1 pound of jasper mix.
ROCK POLISHING GRIT – There are 20 total rock tumbler grit packets in the kit, enough for five complete tumbling cycles with any rock tumbler!
JEWELRY SETTINGS – Once your rocks are polished, use the 5 included jewelry settings to create beautiful keepsakes or use the included storage pouch to keep your favorite specimens all in one place!
DETAILED LEARNING GUIDE – The learning guide includes polishing instructions along with fascinating information about the stones in the kit.
HIGH-QUALITY EDUCATIONAL TOYS – We’re proud to make the highest quality hands-on science toys, and all our products are backed by exceptional service. If your experience is less than stellar, let us know and we’ll make things right!