Gift Cards


18 in stock
Curbside Pickup Available or home delivery on in-town orders*

Recommended for ages 8 years to adult


Imagine taking dull, ordinary rocks and magically transforming them into sparkling gems... Now you can! With the Hobby Rock Tumbler from Discover with Dr. Cool, making beautiful gemstones is easy! Just add the polishing grit, water and unpolished stones into the tumbling machine and set the timer. The machine will polish your stones into beautiful, shining gems! There is no better way for boys and girls to learn about geology. This science kit will provide hours of fascinating science fun and comes with everything you need to start exploring the exciting hobby of rock tumbling.


  • The Hobby Rock Tumbler from Discover with Dr. Cool includes a tumbler and barrel, half pound of gemstones (9 different types), polishing grit (4 grades), jewelry fastenings, learning guide and instructions – a complete kit!
  • Features a noise-reducing rubber barrel with stainless steel lid that is both leak-proof and much quieter than plastic barrels.
  • This easy-to-use tumbler has a programmable timer, giving you bigger results with less energy while never over-tumbling your rocks.
  • With the included jewelry fastenings, kids can even make their very own custom jewelry. Just mount the polished gems into the fastenings and they’re ready to wear!
  • Discover with Dr. Cool is a name parents trust. Founded by a teacher and a life-long rock hound back in 2009, Dr. Cool has won over 100 awards for the play value, educational content and overall quality of their toys. 
  • The Hobby Rock Tumbler includes:
    • High-quality tumbling machine
    • Noise-reducing rubber barrel with stainless steel lid
    • Half pound of semi-precious, rough stones, including amethyst, quartz, tiger’s eye, jasper, agate and more!
    • 4 grades of polishing grit
    • 5 jewelry fastenings
    • Adventure guide with educational information written by teachers
    • Activity booklet with 10 puzzles and games to solve
    • Easy-to-follow tumbling instructions
    • Features a 2-year manufacturer warranty.
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