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

NATIONAL GEOGRAPHIC Rock Tumbler Grit & Media Refill Kit – Rock Polishing Supplies Kit, 4-Stage Silicon Carbide Bulk Grit, 1.5 Pounds of Ceramic Pellets, Stone Tumbling & GemFoam Polishing Media

NATIONAL GEOGRAPHIC Rock Tumbler Grit & Media Refill Kit – Rock Polishing Supplies Kit, 4-Stage Silicon Carbide Bulk Grit, 1.5 Pounds of Ceramic Pellets, Stone Tumbling & GemFoam Polishing Media

Product ID: 394896877

✨Patent-pending GemFoam for dazzling shine

🪨1.5 lbs ceramic media reduces breakage & noise

⚙️4-stage silicon carbide grit for precision polishing

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

6773022₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered 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 Vietnam.

Secure transaction

Description

✨ Turn rough stones into polished gems—because your collection deserves to shine!

GEM FOAM BRILLIANCE - Add the patented GemFoam for an unmatched, showroom-quality polish every time.
CERAMIC MEDIA MAGIC - Quiet, efficient tumbling with less rock breakage and perfect filler for small batches.
AWARD WINNING QUALITY - Backed by National Geographic and Toy of the Year-winning innovation for STEM excellence.
UNIVERSAL COMPATIBILITY - Works seamlessly with any rock tumbler—upgrade your setup without limits.
PRECISION 4 STAGE POLISHING - From rough to radiant—silicon carbide grit sculpts and shines every stone.

The National Geographic Rock Tumbler Grit & Media Refill Kit includes a complete 4-stage silicon carbide grit system, 1.5 pounds of ceramic tumbling media, and patented GemFoam polishing media. Designed to enhance rock tumbling efficiency by reducing noise and breakage, this kit delivers professional-grade polish compatible with all rock tumblers. Ideal for STEM learning and creative exploration, it’s a trusted, award-winning solution for turning raw stones into dazzling gems.

Specifications

Educational Objective(s)	STEM
Model Number	NGFOMCERGRIT
Number of Game Players	1
Assembly Required	No
Batteries Required	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Glass,Gems
Remote Control Included?	No
Colour	Black
Product Dimensions	19 x 13.49 x 14 cm; 2.52 kg
Item model number	NGFOMCERGRIT
Manufacturer recommended age	8 years and up
Manufacturer	JMW Sales, Inc.
Item Weight	2 kg 520 g

Reviews

S**E

good stuff

26.02.2025

K**Y

Rock Tumbling kit

28.08.2025

R**T

Quality and functionally.

17.06.2024

C**T

Very quiet

17.09.2025

L**U

Rock tumbler grit

3.10.2025

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

6773022₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered 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 Vietnam.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews