Dan&Darci Advanced Professional Rock Tumbler Kit - with Digital 9-Day Polishing Timer & 3 Speed Settings - Turn Rough Rocks into Beautiful Gems : Great Science & STEM Geology Toy for Kids All Ages
Dan&Darci Advanced Professional Rock Tumbler Kit - with Digital 9-Day Polishing Timer & 3 Speed Settings - Turn Rough Rocks into Beautiful Gems : Great Science & STEM Geology Toy for Kids All Ages
Turn a handful of rough rocks into polished gems.
A proper digital rock tumbler — not a toy. A 9-day programmable timer, three speed settings and a four-stage grit system do the work while your kids watch dull stones turn into glossy, jewellery-grade gems. One of the best hands-on STEM gifts going.
Real geology, on the kitchen bench.
Drop in rough stones, add grit and water, set the timer and let it run. Over several days the barrel grinds the rocks from coarse to glass-smooth — the same process that takes nature thousands of years, sped up on your counter. The payoff is a jar of gleaming gems your child made themselves.
A complete kit — nothing else to buy.
- Advanced tumbler with digital 9-day timer & 3 speeds
- Low-noise 1 lb barrel with leak-resistant cover
- 0.5 lb of assorted rough gemstones to start
- 4 grit packets — coarse, medium, pre-polish, polish
- Jewellery fastenings (necklace, rings, pendant cages)
- Mesh strainer, spare motor belt & power cord
- Illustrated manual & learning guide + storage bags
Quiet enough to run overnight.
The heavy-duty rubber barrel runs low and quiet, with a leak-resistant, reinforced cover — so a multi-day tumble doesn't take over the house. The digital panel shows days remaining and lets you pause and resume, so you're never guessing where the cycle is up to.
"The kind of present a kid remembers making, not just getting."
A toy tumbler vs a real one.
A basic tumbler
- Single speed, manual guesswork
- Loud motor you can't run at night
- Just the machine and a bit of grit
- Thin barrel that leaks
This kit
- Digital 9-day timer + 3 speeds
- Low-noise barrel, run it overnight
- Stones, 4 grits, jewellery fastenings, guide
- Heavy-duty leak-resistant barrel
How long does it take to polish a batch?
A full cycle runs across the four grit stages over roughly a week of tumbling. The digital timer (up to 9 days) handles the timing — you just change the grit between stages.
Is it loud?
No — the heavy-duty rubber barrel is designed for low-noise running, so most families happily run it overnight or in a laundry/garage.
What age is it suitable for?
Recommended for ages 8 and up. Younger children love it with a parent helping change the grit and water between stages.
Do I need to buy anything else?
No. It comes with starter stones, all four grits, jewellery fastenings, a strainer, spare belt and a learning guide. Refill grit and stones are easy to find when you want more.
Can you really make jewellery with it?
Yes — the included fastenings (necklace cord, rings and pendant cages) turn finished stones into wearable pieces.
The science gift that actually gets used.
Digital timer, three speeds, a complete starter kit and jewellery fastenings. Add it to your cart above.