National Geographic Hobby Rock Tumbler Kit

A complete rock-tumbling kit that turns rough stones into polished gemstones.

• Includes the tumbler, nine types of rough gemstones, four polishing grits and jewellery fastenings.
• Leakproof rubber barrel, quieter than plastic models.
• One-touch timer with automatic shut-off, plus a full-colour learning guide.

A patient, hands-on science gift for kids who collect rocks on every walk. The polished stones become their own gifts later.