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National Geographic GemFoam Reusable Rock Polisher for Rock Tumblers
✅ 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 20, 2026 11:09 AM · 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.
- 🏷️The retail sticker price has been slashed by 76% — a steep markdown from the official listing.
- 📉Pricing has not dipped this low in roughly six months, placing this offer among the better deals in that window.
- ➡️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
1.37/20
Deal Strength
10/20
Momentum
4/10
📝 Product Overview
🏪 Sold by
Amazon.com
🚚 Shipping
Free Shipping
Product Details
✓A BRAND NEW WAY TO MAKE TUMBLED ROCKS SHINE – GemFoam is a unique new rock polishing 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!
✓A LITTLE GOES A LONG WAY – Add a pack of GemFoam to your rock tumbling arsenal and use for multiple tumbling projects. GemFoam is reusable for up to 6 rock polishing cycles and comes with a convenient reusable bag made of mesh for easy storage.
✓WORKS WITH ANY ROCK POLISHER - GemFoam is safe to use with any durable tumbler. For best results, use with our National Geographic line of tumblers and rock tumbling supplies, like our ceramic media, tumbling grit, and rock refill packs.
✓EASILY IMPROVE YOUR ROCK TUMBLING RESULTS - When your final rock tumbling grit cycle is complete, add GemFoam, water, and the rocks you'd like polished back to the tumbler and tumble up to 3 days. Rocks will will come out with polish and shine!
✓AMAZON EXCLUSIVE - Blue Marble has developed this product exclusively for Amazon.
✓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
4.72 x 1.18 x 7.28 inches
1.23 ounces
B08B7DJTCR
4.4
8 years and up
See Top 100 in Industrial & Scientific
Product Dimensions
4.72 x 1.18 x 7.28 inches
Item Weight
1.23 ounces
ASIN
B08B7DJTCR
Item model number
NGFOMBAG
Manufacturer recommended age
8 years and up
Best Sellers Rank
See Top 100 in Industrial & Scientific
Customer Reviews
4.4
Release date
July 15, 2020
