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✨ Rock your world with brilliance and style 🪨
The National Geographic Rock Tumbler Refill Kit is a complete, high-quality rock polishing set featuring 3 pounds of authentic Madagascar rocks, premium silicon carbide grit, ceramic media to reduce noise and breakage, and innovative GemFoam polish for unmatched shine. Designed for ages 8 and up, this STEM-backed kit offers an educational and fun lapidary experience, perfect for hobbyists and jewelry makers seeking professional-grade results.





| ASIN | B08B7JBVG9 |
| Age Range Description | 8 years and up |
| Best Sellers Rank | #1,075 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Tumbling Media |
| Brand Name | Blue Marble |
| Customer Reviews | 4.7 4.7 out of 5 stars (18,572) |
| Educational Objective | Learn About Geology |
| Global Trade Identification Number | 00816448027505 |
| Included Components | 1.5 pounds of Ceramic Media, 10 mL Grit Scoop, 3 Pound Madagascar Rock Refill Mix, 30 g GemFoam, 4 Stages of Silicon Carbide Polishing Grit Compound, Detailed Learning Guide with Instructions, Jewelry Fastenings |
| Is Assembly Required | No |
| Item Dimensions | 9.84 x 7.09 x 5.51 inches |
| Item Type Name | Complete Rock Polisher Tumbler Media Kit |
| Item Weight | 3 Pounds |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer Maximum Age (MONTHS) | 1188.0 |
| Manufacturer Minimum Age (MONTHS) | 96.0 |
| Manufacturer Part Number | NGFOMCERGRTMD |
| Manufacturer Warranty Description | We're proud to make the highest quality products which are backed by exceptional service. |
| Material Type | Rocks, Silicon Carbide, Ceramic, GemFoam, Metal |
| Model Number | NGFOMCERGRTMD |
| Operation Mode | Manual |
| Size | Medium |
| Supported Battery Types | No batteries required |
| Theme | media |
| UPC | 816448027505 |
| Unit Count | 1.0 Count |
S**.
Good purchase
Great tumbler. Use it frequently with no problems.
B**F
ROCK ON!
Let me spill the gems on a rock-solid addition to my lapidary adventures – the NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit. As a self-proclaimed rock enthusiast, this kit has truly rocked my world, giving my gemstones the shine they deserve. What's crystal clear about this refill kit is its top-notch quality. Packed with premium grit and polish, it's like giving your rocks a spa day. Whether I'm polishing up some quartz or tumbling some jasper, this kit ensures that my gemstones shine bright like a diamond. Using the NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit is a gem of an experience. Its easy-to-follow instructions make it a breeze to use, and the results speak for themselves – my stones come out looking so polished, they could rival any jewel in the crown jewels. Since I started using this refill kit, my rock tumbling game has gone from pebble to precious stone. Whether I'm crafting jewelry or just adding some sparkle to my collection, the NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit is my go-to for achieving that rockstar shine. In summary, if you're a rock enthusiast looking to add some sparkle to your collection, the NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit is a gem of a find. With its top-quality materials and stunning results, it's sure to rock your world.
A**.
Does what it supposed to do
Great product
R**K
A good product
On time and as described, it works well!
L**S
Decent Value for Hobbyist
These are the same grits that come with the tumbler kit. The scoop that comes with it is a nice addition. I've found that some grits get used faster than others, so it may be worthwhile to find a supplier that sells individual grits. Depending on where you find your rocks, you may find that some of the heavier grits are not needed as much as the finer grits. Most rocks I've polished came from riverbeds and are fairly smooth to start with. In my experience, you can start with the 3rd grit on these and still get the desired results in less time since you can skip the first grit or two which is about 2 weeks of tumbling. Another tip, get some dishes like cake pans or casserole dishes at the dollar store and pour the water/grit from the tumbler into them and let the water evaporate. I have one pan for each grit. You can then reuse the media several times before discarding it.
L**O
Even when I watched the weight and consistency of my rocks the motor died
These motors don’t even last long enough to get a shine on my rocks
C**N
Best grit yet 😉
This is the best grit that I've used so far. It comes in four little great containers for each step with a little tiny scoop that's perfect for measuring out. I will be buying this over and over again.
K**A
Good grit
This grit works really well on obsidian. It came nicely packaged, and was a good price.
F**M
It helps shaping stones too..it is a little sound and I'm living 2floor so I put a box on it to make the noise more silent
C**O
facile a utiliser apres avoir utiliser mon 1200 grit
S**E
exactly as pictured
E**S
Word like it’s supposed to. Will buy them again.
M**E
Passt und erfüllt seinen Zweck
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