8 bestRock Tumblers For Adultsof May 2025

National Geographic Professional Rock Tumbler Kit- Rock Polisher for Kids and Adults, Complete Rock Tumbler Kit with Durable Tumbler, Rocks, Grit, and Our New GemFoam Polisher, A Great STEM Hobby

Blue Marble

Editor’s Choice

9.9

NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Complete Rock Polisher Kit, Durable Leak-Proof Tumbler, 227 Grams of Rocks, Grit, 5 Jewellery Fastenings

29% off

Blue Marble

9.8

National Geographic Rock Tumbler Machine - Amazing Gemstone Polishing Machine with Authentic Grit, Stones and Crystals | STEM Educational Rock Polisher Hobby Kit Gifts for 8+ Year Old Boys and Girls

National Geographic

9.6

Advanced Professional Rock Tumbler Kit - with Digital 9-day timer & 3-speed polisher settings - UK/EU Edition Turn Rough Rocks into Beautiful Gems : Great Geology Science Kit STEM Gift for all ages

Dan&Darci

9.4

National Geographic Rock Tumbler Kit - 1.36 kg Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Includes Rocks for Tumbling & Rock Polisher Grit, Rock Tumbler Machine for Adults and Kids

5% off

Blue Marble

9.2

OtherRelated productsUp to 33% off

National Geographic Rocks & Fossils Kit - 200+ Piece Set Including Geodes, Real Fossils, Rose Quartz, Jasper, Aventurine & More Rocks, Crystals & Gemstones

National Geographic Crystal Growing Kit - 3 Vibrant Coloured Crystals to Grow with Light-Up Display Stand & Guidebook, Includes 3 Real Gemstone Specimens Including A Geode & Green Fluorite

NATIONAL GEOGRAPHIC Earth Science Kit - Over 15 Science Experiments & STEM Activities for Kids, Includes Crystal Growing Kit, Volcano Science Kit

National Geographic Mega Crystal Growing Lab – Grow 6 Vibrant Crystals, Crystals Grow Fast in 3-4 Days, Includes Light-Up Display Stand, Full-Colour Learning Guide, and 4 Genuine Crystal Specimens

KomeStone K1 Pro Professional Cutting-Edge Brushless Motor Advanced Rock Tumbler Polisher Kit, Extra Large 2.5Lb Barrel with 3-Speed Motor 9-Day Timer, 6 Belts, Rough Gemstones, 4 Polishing Grits etc.

KomeStone

8.9

National Geographic Rock Tumbler Refill Kit – 453 g Gemstones and Rocks for Tumbling including Unpolished Amethyst and Quartz – Rock Tumbler Supplies include Rock Tumbler Grit & Jewellery Accessories

National Geographic

8.6

Dan&Darci Mega Rock Tumbler Refill Kit - 9 Varieties of Gems - 0.5 lb, 4 Grit Levels, Jewelry Fasteners, Compatible with All Tumblers Rock Tumbling Supplies

Dan&Darci

8.3