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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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National Geographic Rock Tumbler Media – The Ultimate Rock Polishing Supplies Kit, 4 Stage Bulk Rock Tumbler Grit, 1.5 Pounds of Ceramic Pellets, GemFoam Polishing Tumbling Media

Product ID: 385689541

💎Patented GemFoam for unmatched rock shine

🧱1.5 lbs ceramic media reduces noise & breakage

⚙️4-stage silicon carbide grit for precision polishing

1128035Fr

Duties & taxes included

In stock

Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Congo.

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Description

💎 Polish like a pro, shine like a legend!

CERAMIC MEDIA MAGIC - Quiet your tumbler and protect your stones with 1.5 lbs of noise-dampening, breakage-reducing ceramic pellets.
UNIVERSAL COMPATIBILITY - Works seamlessly with any rock tumbler—upgrade your setup without limits.
GEM FOAM BRILLIANCE BOOST - Add the patented GemFoam for a dazzling, museum-quality shine that turns heads.
PRECISION 4 STAGE POLISHING - From rough to radiant—silicon carbide grit sculpts and polishes with expert accuracy.
AWARD WINNING STEM EXPERIENCE - Backed by National Geographic and Toy of the Year winner Blue Marble, this kit inspires creativity and scientific curiosity.

The National Geographic Rock Tumbler Media Kit includes 4 stages of premium silicon carbide grit, 1.5 pounds of ceramic media to reduce noise and rock breakage, and patented GemFoam for superior polishing shine. Compatible with all rock tumblers, this award-winning STEM kit delivers professional-grade results and inspires creativity for ages 8 and up.

Specifications

Age Range Description	8 years and up
Asin	B08B7GRBK6
Best Sellers Rank	609,471 in Toys & Games (See Top 100 in Toys & Games) 372 in Polishing & Buffing 19,360 in Learning & Education Toys
Brand Name	Blue Marble
Colour	Multi-color
Customer Reviews	4.6 4.6 out of 5 stars (2,102) 4.6 out of 5 stars
Educational Objective	STEM
Global Trade Identification Number	00816448027512
Included Components	1.5 Pounds of Ceramic Media, 10 mL Scoop, 30 g GemFoam, 4 Stages of Silicon Carbide Polishing Grit Compound
Indoor Outdoor Usage	Indoor
Is Assembly Required	No
Item Dimensions	19 x 13.5 x 13.9 centimetres
Item Type Name	Ultimate Rock Polishing Supplies Kit
Manufacturer	National Geographic
Manufacturer Part Number	NGFOMCERGRIT
Manufacturer Recommended Age	8 years and up
Material Type	Resin, Foam
Model Number	NGFOMCERGRIT
Number Of Packs	1
Operation Mode	Manual
Set Name	Ultimate Rock Polishing Supplies Kit
Size	Medium, Small
Theme	Fantasy
Unit Count	1.0 count
Upc	816448027512

Reviews

User

Rock Tumbling kit

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

User

Perfect

Great set really has just about everything you need.

29.09.2026

User

Works great.

Grandkids love tumbling the stones they mine in Gatlinburg. Grandpa is happy.

14.10.2026

User

Very quiet

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

17.09.2025

User

Everythings perfect

13.07.2026

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1128035Fr

Duties & taxes included

In stock

Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Congo.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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