Can Gemfoam be purchased separately?

Yes, we do sell the Polishing Foam separately.

What is the difference between this and product # ngbulkgrit?

Thank you so much for your inquiry. This item (the Complete Media Kit) contains the grit along with GemFoam to assist in the polishing stage and Ceramic Pellets to reduce rock breakage along with making the tumbling process more quiet. The Bulk Grit does not contain the GemFoam or pellets, but does contain the grit.

How much of each medium is included in this accessories set?

The jars shown hold approximately 2/3 of a cup, so plan on buying bulk bags in the near future.

My lid cracked and i need a new one. Are there replacement parts avaliable to buy?

Not sure if you are referring to the tumbler canister lid but you will find replacement parts on Ebay under rock tumbler parts

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Description

✨ Elevate your rock game—because ordinary stones don’t make the cut! ⚙️

GEM FOAM BRILLIANCE - Add the patented foam for a dazzling, showroom-quality shine that turns heads.
CERAMIC MEDIA MAGIC - Quiets your tumbler, cushions stones, and boosts grit efficiency—rock tumbling, upgraded.
CONFIDENCE IN EVERY KIT - Backed by National Geographic’s STEM promise and satisfaction guarantee—polish with peace of mind.
UNIVERSAL COMPATIBILITY - Works seamlessly with any rock tumbler—no upgrades needed, just better results.
PRECISION 4 STAGE GRIT SYSTEM - From rough shaping to flawless polish, every step engineered for perfection.

The National Geographic Stone Rotating Drum Complete Media Kit is a premium rock tumbling accessory set featuring a 4-stage high-quality silicone carbide grit, 1.5 lbs of ceramic media to reduce noise and breakage, and a patent-pending GemFoam polishing media that delivers an exceptional shine. Compatible with all rock tumblers, this kit is designed to optimize every stage of the tumbling process, ensuring professional-grade polished stones with ease. Perfect for hobbyists and STEM enthusiasts aged 8 and up, it combines durability, efficiency, and a satisfaction guarantee from a trusted global brand.

Specifications

ASIN	B08B7GRBK6
Amazon Bestseller	#335,705 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #3,213 in Hardware Locks
Batteries Included	No
Batteries Required?	No
Customer Reviews	4.7 4.7 out of 5 stars (1,988)
Date First Available	September 2, 2020
Item model number	NGFOMCERGRIT
Manufacturer recommended age	8 years and up
Material Type(s)	Multiple
Model Number	NGFOMCERGRIT
Number of Game Players	1
Product Dimensions	19 x 13.51 x 13.89 cm; 2.52 kg
Target Gender	Unisex

Reviews

S**E

exactly as pictured

26.02.2025

K**Y

I am surprised at how well this kit works. Just follow the instructions and you’ll have wonderfully polished rocks. I bought this kit and a separate tumbler just out of curiosity. I have so many rocks on the shelf now I’m sure my wife is hiding them. Definitely worth the purchase.

28.08.2025

R**T

This kit contains all that is required to produce polished stones of a high standard. The gemfoam gives a quality polish to be proud of. Those who tumble more often may require a bulk buy but this kit would suit most hobbyist.

17.06.2024

C**T

Original tumbler had a fault but it was replaced very quickly. Excellent customer service and excellent product. Verrry quiet.

17.09.2025

L**U

Did the job. Rocks coming out smooth.

3.10.2025

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NATIONAL GEOGRAPHIC Stone Rotating Drum Complete Media Kit Stone Polishing Grit Ceramic Pellets Patented Polishing Foam Stone Polishing Kit Madagascar Rock

Description

Specifications

Reviews

Common Questions