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National Geographic Rock Tumbler Grit and Rock Polishing Refill Kit
✅ In stock
F
Grade
Analysis Confidence
100%
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Sep 18, 2026 7:51 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- 💰The current price is slightly above the going rate for this product — worth watching for a drop.
- 🏷️A 22% cut from the official retail price adds further appeal.
- 📉Going back roughly eight months, a more competitive price has not appeared — this stands out as a strong value by recent standards.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0.07/20
Deal Strength
13/20
Momentum
4/10
📝 Product Overview
🏪 Sold by
Amazon.com
🚚 Shipping
Free Shipping
Product Details
✓QUALITY GRIT RESULTS IN A DAZZLING POLISH - The rock polishing grit in this pack is high-quality silicon carbide and will polish 8-10 lbs of rocks, includes measuring scoop and storage containers with secure screw-top closures for easy storage.
✓3 POUNDS OF ROCKS FROM MADAGASCAR - Keep your rock tumbler going with 3 pounds of rocks from Madagascar. This rock refill pack can include rose quartz, jasper, and other rock and gemstone varieties.
✓IMPROVE YOUR ROCK TUMBLING RESULTS - Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, quieting tumbler noise, reducing rock breakage, and acting as a filler for smaller batches.
✓AN INNOVATIVE WAY TO MAKE TUMBLED ROCKS SHINE - GemFoam is a unique new rock polisher media that gives unprecedented shine to tumbled rocks. Just add the patent-pending rock polishing media to your tumbler after the final grit cycle for great results!
✓AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!
⚙️ Specifications
9.84 x 7.09 x 5.51 inches
3 pounds
B08B7JBVG9
4.7
8 years and up
See Top 100 in Industrial & Scientific
June 15, 2020
English
Product Dimensions
9.84 x 7.09 x 5.51 inches
Item Weight
3 pounds
ASIN
B08B7JBVG9
Item model number
NGFOMCERGRTMD
Manufacturer recommended age
8 years and up
Best Sellers Rank
See Top 100 in Industrial & Scientific
Customer Reviews
4.7
