National Geographic Hobby Rock Tumbler Kit – Durable Leak-Proof Rock Polisher with 7-Day Timer, Complete Rock Tumbling Kit with Grit, Jewelry Settings & GemFoam Polish, Educational STEM Science Kit

Price: $64.99 - $69.99
(as of Dec 19, 2025 13:08:05 UTC – Details)

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Your purchase has purpose!

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

CREATE YOUR OWN GEMSTONES – Rock tumbling is a hugely popular hobby for kids and adults! This robust rock polisher makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design.
A TUMBLER THAT’S MADE TO LAST – The durable motor has time and speed control settings so you can set it, and forget it. An improved, leak-proof barrel features a stainless-steel lid.
ALL-IN-ONE TUMBLING KIT – You get 1/2 pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, tumbler grit, a strainer, and our innovative new GemFoam polishing foam.
USE GEMFOAM FOR DAZZLING RESULTS – This rock tumbling kit stands apart from others thanks to our new, reusable GemFoam rock polisher! Add GemFoam and water to the barrel after your final tumbling stage and your gems will have incredible shine!
AWARD-WINNING PRODUCTS – Blue Marble, winner of the Toy Association’s prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!