- Flapen Score
- 45 / 100Ranks 4,022 of 5,777 Home & Garden niches · −6 vs the category median of 5145
- Market size
- £101K/yr153K searches / yr
- 90-day growth
- +33.2%search demand this quarter
- Competition
- 70%top-5 click share · 5 brands · 13 sellers
Flapen Score
Rock Tumbler against its category
The dotted line is the Home & Garden average. Past it, Rock Tumbler is stronger. Inside it, weaker.
Market
The Rock Tumbler market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for Rock Tumbler 153K times last year and spent an estimated £101K. All 5 brands take every click. Demand peaks in Nov–Dec. Flapen scores it 45 out of 100, a Fail.
01 · Demand
1.3% of searches ended in a purchase last week.
Shoppers searched for this 153K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. In the latest week, 1.3% of those searches ended in a purchase. Searches in the last 90 days moved +33.2% against the 90 days before. Searches, conversion and average price together put the market at an estimated £101K a year.
- Searches, last 12 months
- 153K
- Growth, 90 days vs prior 90
- +33.2%
- Conversion, latest week
- 1.3%
- Market size, estimated
- £101Ka year
- Peak month
- December2.6× the quietest month
- Top search term
- rock tumbler72K searches a year
02 · Price
A sale here is worth £50.88.
Listings sell for £50.88 on average, from £24.30 to £83.69. Amazon reports units sold in ranges. This niche sold 3K to 4K a year. The average listing sells 100 to 250 of them. At £50.88 that is £5K to £13K a year per listing.
- Average price
- £50.88inside the $15 to $100 sweet spot
- Price range
- £24.30–£83.69
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 3K–4K
- Units per listing a year
- 100–250
- Revenue per listing a year
- £5K–£13K
- Returns
- 1.8%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is ads and reviews.
92% of listings pay for placement with sponsored ads. 92% ship with Prime. On an average day, 29.6% of listings are out of stock. The average listing ranks #331 within Glassware. It carries 2,192 reviews at 4.22 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 92%
- Prime listings
- 92%
- Out of stock, average day
- 29.6%
- Average rank
- #331in Glassware
- Average rating
- 4.22 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 2,192per listing
- Listings tracked
- 12
04 · Newcomers
Amazon counts 1 of last year's 5 launches as successful.
5 products launched here in the last 12 months. Amazon counts 1 of them as successful launches, new products that hit its first-year sales bar. The brands on the shelf have sold for 34 months on average, so a newcomer is not facing entrenched names.
- Launched, last 12 months
- 5
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 34 months
Products
Top Rock Tumbler products & what they sell for
Every tracked product: its share of the shelf, its reviews, and its price.
Top sellers
by 90-day click share
NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Rock Polisher for Kids & Adults Durable Noise-Reduced Barrel Rocks Grit & New GemFoam for a Shiny Finish Cool Toys Great STEM Hobby Kit
- Price
- £51.10
- Rating
- 4.2/5
- Reviews
- 5,840
- Age
- 6y ago

Professional Rock Tumbler Machine Rocks Polishing Machine Kit with Noise Reduction Cover for Kids Adults & Rock Collector 3-Speed Motor & 9-Day Timer Geology Hobby Toy Gift (2026 Upgrade)
- Price
- £37.51
- Rating
- 3.8/5
- Reviews
- 49
- Age
- 7mo ago

NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Includes Rough Gemstones 4-Stage Silicon Carbide Polishing Grit Jewellery Fastenings & Learning Guide - STEM Science Kit for Geology Enthusiasts
- Price
- £36.84
- Rating
- 4.2/5
- Reviews
- 10,791
- Age
- 9y ago

Professional Rock Tumbler Machine Rocks Polishing Machine Kit with Noise Reduction Cover for Kids Adults & Rock Collector 3-Speed Motor & 9-Day Timer Geology Hobby Toy Gift (Orange 2026 Upgrade)
- Price
- £37.41
- Rating
- 3.8/5
- Reviews
- 49
- Age
- 7mo ago

National Geographic Professional Rock Tumbler Kit- Stone Polisher for Kids and Adults Complete Kit with Durable Tumbler Rocks Grit and GemFoam Polisher A Great STEM Hobby
- Price
- £67.68
- Rating
- 4.2/5
- Reviews
- 4,257
- Age
- 6y ago
Trending
90-day click momentum
Professional Rock Tumbler Machine Rocks Polishing Machine Kit with Noise Reduction Cover for Kids Adults & Rock Collector 3-Speed Motor & 9-Day Timer Geology Hobby Toy Gift (2026 Upgrade)
- Price
- £37.51
- Rating
- 3.8/5
- Reviews
- 49
- Age
- 7mo ago

Professional Rock Tumbler Machine Rocks Polishing Machine Kit with Noise Reduction Cover for Kids Adults & Rock Collector 3-Speed Motor & 9-Day Timer Geology Hobby Toy Gift (Orange 2026 Upgrade)
- Price
- £37.41
- Rating
- 3.8/5
- Reviews
- 49
- Age
- 7mo ago

NATIONAL GEOGRAPHIC Rock Tumbler Grit & Media Refill Kit Rock Polishing Supplies Kit 4-Stage Silicon Carbide Bulk Grit 680 g of Ceramic Pellets Stone Tumbling & GemFoam Polishing Media
- Price
- £34.71
- Rating
- 4.6/5
- Reviews
- 53
- Age
- 11mo ago

NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit 1.36 kg of Rough Gemstones & Rocks for Tumbling including Amethyst and Quartz Tumbling Grit & Supplies Gems for Polishing Silicon Carbide Grit
- Price
- £24.30
- Rating
- 4.2/5
- Reviews
- 99
- Age
- 1y ago

Professional Rock Tumbler Kit 4LB Large Capacity Barrel with Brushless Motor & Heavy Metal Base Adjustable Speed & 9-Day Timer Includes All Accessories Rock Polisher for Adults & Collectors
- Price
- £81.05
- Rating
- 4.6/5
- Reviews
- 201
- Age
- 11mo ago
Newest
by launch date
Professional Rock Tumbler Machine Rocks Polishing Machine Kit with Noise Reduction Cover for Kids Adults & Rock Collector 3-Speed Motor & 9-Day Timer Geology Hobby Toy Gift (Orange 2026 Upgrade)
- Price
- £37.41
- Rating
- 3.8/5
- Reviews
- 49
- Age
- 7mo ago

Professional Rock Tumbler Machine Rocks Polishing Machine Kit with Noise Reduction Cover for Kids Adults & Rock Collector 3-Speed Motor & 9-Day Timer Geology Hobby Toy Gift (2026 Upgrade)
- Price
- £37.51
- Rating
- 3.8/5
- Reviews
- 49
- Age
- 7mo ago

Professional Rock Tumbler Kit 4LB Large Capacity Barrel with Brushless Motor & Heavy Metal Base Adjustable Speed & 9-Day Timer Includes All Accessories Rock Polisher for Adults & Collectors
- Price
- £81.05
- Rating
- 4.6/5
- Reviews
- 201
- Age
- 11mo ago

NATIONAL GEOGRAPHIC Rock Tumbler Grit & Media Refill Kit Rock Polishing Supplies Kit 4-Stage Silicon Carbide Bulk Grit 680 g of Ceramic Pellets Stone Tumbling & GemFoam Polishing Media
- Price
- £34.71
- Rating
- 4.6/5
- Reviews
- 53
- Age
- 11mo ago

Acmeenjoy Rock Tumbler Kit Barrel Stone Polishing Machine with 9-Speed Motor & 9-Day Timer Rock Polisher Machine for Kids & Adults Includes Gemstones Grits and DIY Tools
- Price
- £58.94
- Rating
- 4.4/5
- Reviews
- 40
- Age
- 1y ago
Competition
Competition: brands, sellers & click share
The top 5 products take 70% of clicks. A locked shelf that new listings rarely crack.
Brands
5 falling
Sellers
13
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
70%
Top 20: 100%
Open market
0%
- Blue Marble53%
- Jofuni28%
- StemRock12%
- Acmeenjoy5%
- KomeStone4%
- Open — no brand owns it (0%)
Demand
Rock Tumbler search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Nov, Dec · busiest ÷ quietest = 2.6×
Search terms
Top Rock Tumbler search terms shoppers use
The exact words shoppers type, with yearly volume, growth, and conversion.
- rock tumbler72K/yr
- rock tumbler machine25K/yr
- stone polishing machine11K/yr
- stone polishing kit7K/yr
- rock polisher9K/yr
- stone polisher5K/yr
- stone tumbler machine uk5K/yr
- rock tumbler kit6K/yr
- stone tumbler4K/yr
- national geographic rock tumbler4K/yr
Reviews and returns
What reviews say buyers love and hate about Rock Tumbler
What buyers praise, what they complain about and why they send it back, from the reviews.
Complain
Not built to last
Band breaks
Broke after 6 weeks
It's a fairly noisy unit from the motor
A little noisy perhaps
Is quite noisy when turned on
Rubbish
Garbage product
Bad quality build
Not worth it
Over priced, no interaction and will only get used once
It is a bit pricey for what it is
No instructions
That there are no instructions with the Rock tumbler
Love
My son said it was well made
Good kit
Good quality
Easy to use
The kit is relatively easy to use although as others have said you may wish to watch some online tutorials to work out the best options for timing
when you have done it a few times it gets easier
Works fine
it seems to work well
Works well, pleased with the results of this product as we have used this before
Good machine for the price
Good value for money to start the hobby
Great product and a great price
that is part of the fun
its much more fun to collect
Plenty of media for multiple batches so its great value for hobbyists or families into geology fun
Return
1.8% Return rate 18% Fixable by listing
Not built to last
Band breaks
Broke after 6 weeks
ended up returning the whole thing as it was not functioning as it should
It's a fairly noisy unit from the motor
A little noisy perhaps
Is quite noisy when turned on
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Rock Tumbler questions
Answered from the same tracked data.









