What is the power consumption of this unit over a week of continuous use? (in usa on 110v). thank you.

This takes .3 Amps, so (watts = amps x volts) OR watts = .3 x 110 which equals33 watts. Now for one week would equal 33 watts x 7 days x 24 hours =5544 watts or 5.54 kilowatts for one week.At $.16 per kilowatt it comes to $.89 per week.

What the difference between this and the starter kit?

There are two main differences:The Hobby Rock Tumbler has a rubber tumbling barrel with a stainless steel cap, which reduces noise and is more durable. The Starter Kit Rock Tumbler has a plastic barrel. The Hobby Rock Tumbler also has a keypad for setting the number of days you would like it to tumble, where as the Starter Kit Rock Tumbler's setting options are on/off. Thank you for your inquiry.

What pound tumbler is this product?

Dearest National Geographic.... why would you only send 1# of rocks with a two pound tumbler?

Can i buy extra grit without the rocks. we have many rocks from "mining" gemstones that i would love to polish. what do you recommend?

I recommend you follow the rock tumbler hobbiest MIchigan Rocks on Youtube. He's a good wealth of information for anyone getting into rock tumblers. He and other's mention that the polish from National Geographic is not good. I would go with rock tumbler polish offered by Polly Plastics.

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Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Polisher With 7-Day Timer - Complete Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Collection

Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Polisher With 7-Day Timer - Complete Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Collection

Product ID: 655664852

Details

Size
Mittel
Brand
Blue Marble
Theme
Geology
Age Range (Description)
8 years and up
Item dimensions L x W x H
33.3 x 12.7 x

💎includes 9 gemstone types & GemFoam polisher

🔒leak-proof stainless steel barrel

⏲️7-day automatic timer

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₩719370

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💎 Turn Rough Rocks into Coveted Gems—Because Your Collection Deserves to Shine!

NEXT LEVEL SHINE - Innovative reusable GemFoam delivers dazzling, professional-grade polish.
STEM MEETS STYLE - Educational science toy that transforms geology into wearable art.
SET IT FORGET IT - Powerful motor with customizable 7-day timer for effortless polishing.
LEAK PROOF DURABLE - Stainless steel lid and barrel ensure mess-free, long-lasting use.
ALL INCLUSIVE GEMSTONE KIT - 2 lbs of rough stones featuring 9 unique gemstones plus jewelry fastenings.

The Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit is a premium, durable rock polisher designed for STEM learning and creative expression. Featuring a leak-proof stainless steel barrel with a 7-day automatic timer, it includes 2 pounds of assorted rough stones with nine gemstone varieties, polishing media, jewelry fastenings, and the exclusive reusable GemFoam for a brilliant finish. Perfect for kids and adults alike, this all-in-one kit combines educational value with hands-on fun, empowering users to craft stunning polished gems and unique jewelry pieces.

Specifications

ASIN	B086Z6ZB7R
Age Range (Description)	8 years and up
Age Range Description	8 years and up
Battery Description	Not required (mains powered)
Best Sellers Rank	#129,313 in Toys & Games ( See Top 100 in Toys & Games ) #3,331 in Science Toys & Kits
Brand	Blue Marble
Country of Origin	USA
Customer Reviews	4.3 out of 5 stars 3,578 Reviews
Educational Objective	STEM
Included Components	1/2 Pound of Assorted Stones from Around the World, 4 Stages of Polishing Grit Media, Easy-to-Follow Instructions, Full-Color Learning Guide, GemFoam Polishing Media, High-Quality Rock Tumbler, Jewelry - Necklace, Key Chain, Ring, and Two Clip-on Earring Fastenings, Noise-Reducing, Leak-Proof Barrel
Is Assembly Required	No
Item Dimensions	33.3 x 12.7 x 20.7 Centimeters
Item Type Name	Hobby Rock Tumbler Kit
Item Weight	1.9 Kilograms
Item dimensions L x W x H	33.3 x 12.7 x 20.7 Centimeters
Language	English
Manufacturer	JMW Sales, Inc.
Manufacturer Part Number	NGHOBBYTUMBLER2
Material	Multiple
Maximum Recommended age	1188.0
Minimum Recommended age	96.0
Model Number	NGHOBBYTUMBLER2
Size	Mittel
Sub Brand	National Geographic
Theme	Geology
UPC	816448028830

Reviews

J**.

12.01.2026

C**L

28.03.2023

J**N

15.04.2026

M**N

26.11.2023

R**E

9.04.2026

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