About this item

Transform rough stones into stunning polished gems with the Thames & Kosmos Rock Tumbler. This user-friendly machine lets young geologists discover the science behind erosion, weathering, and the rock cycle while creating beautiful specimens. Start with included natural samples—tiger's eye, aventurine, rose quartz, and more—plus four polishing grits. Once you've mastered the basics, tumble your own collected rocks, glass, and wood. The durable motor, leak-proof barrel, and noise-reducing design make it perfect for extended experiments. A built-in timer runs up to seven days, so you can set it and forget it. Turn your polished treasures into wearable art using the included jewelry fasteners. The comprehensive manual and poster provide rock identification, formation science, and step-by-step guidance. From Thames & Kosmos, for ages 8 and up