- 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
An estimated 1.3% of those searches ended in a purchase.
Shoppers searched for this 153K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 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
1 of last year's 5 launches cleared the first-year sales bar.
5 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. 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
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 27, 2026. The live listing can differ.
Top sellers
by estimated 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
estimated 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 an estimated 70% of clicks. A locked shelf that new listings rarely crack.
Brands
5 falling
Sellers
13
Est. top-5 brand share
100%
Top 20: 100%
Est. 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 estimated 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
We read the reviews and the return reasons for every product selling here.
“Not built to last”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
21 topics
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.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









