There's treasure hiding in those rough rocks! Budding geologists can tumble ordinary-looking stones into polished gems, then turn their favorites into keepsakes worth showing off.

• Durable rock tumbler features a 450 g capacity, a powerful motor, and a leak-proof, noise-reducing barrel. USB-C powered with cable included.
• Includes 200 g (7 oz) of rough rocks in 10 assorted gemstones, 4 grit packets, a strainer, necklace, keychain, ring, and earring settings, plus a manual and educational poster.