diamond knife sharpener
Worth a lookShows low returns (0.6%), but a small market ($55K/yr) keeps it on the watch list.
Returns
Incredible0.6%return rate — above 5% kills the launch gate
Conversion
Incredible12.7%search→purchase rate — share of searches ending in a sale
Avg price
Great£20.98avg listing price — sweet spot $15–$100
Price range
Great£10.66–£53.44cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good614.07avg incumbent reviews — the moat a new listing must climb
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Okay80%top-5 brand share — brands hold most of the demand
Competition
Bad71%top-5 click share — a locked-up shelf
Growth
Bad-19.6%90-day search growth — must beat 0% to launch
Market size
Bad£55K£55K/yr · 21K searches
According to Flapen's Amazon United Kingdom niche tracking, diamond knife sharpener is a £55K/yr Amazon United Kingdom market (21K searches/yr). The top 5 brands hold 80% of demand. Demand peaks in Sep–Oct–Nov–Dec. Verdict: Worth a look — 50/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
diamond knife sharpener market data
- Units sold / yr
- 2K–2K
- avg 100–250/product
- Revenue / yr
- £31K–£42K
- units × avg price
- Conversion rate
- 12.7%
- Avg BSR
- #49
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 71%
- Out of stock
- 1.8%
- Avg brand age
- 58 months
- Avg seller age
- 192 days
Competition & brand share
The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.Brands
12 falling
Sellers
26
Top-5 brand share
80%
Top 20: 100%
Top-5 click share
71%
Top 20: 100%
Open market
15%
- W WITHLENT30%
- Vogue25%
- Kimura10%
- Navaris10%
- Victorinox5%
- Harnovlis5%
- Open — no brand owns it (6 brands, 15%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -19.6% search growth over the last 90 days.Peak months: Sep, Oct, Nov, Dec · busiest ÷ quietest = 4.6×
Top diamond knife sharpener search terms
- diamond steel knife sharpener9K/yr
- diamond steel6K/yr
- diamond sharpening steel6K/yr
Top diamond knife sharpener products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Diamond Sharpening Steel - 12 inch Knife Sharpener for Master Chef Ideal for Kitchen Knife Cooking Knife Butchers and Japanese Knife Home Gourmet Blade Sharpening Stick
W WITHLENT£12.974.4★299 rev
Vogue D161 Diamond Sharpening Steel Oval 12
Vogue£11.504.5★422 rev
Kimura Professional Diamond Honing Steel 10 inch Honing Rod Diamond Knife Sharpener Magnetized Steel Ergonomic Polypropylene Handle Ideal for Chef Knives Japanese Gift Box
Kimura£22.284.7★156 rev
Navaris Diamond Knife Sharpener Steel - Japanese Chefs Knife Sharpener with Ergonomic Handle - Honing Rod for Chefs Knives Carving Knives and More - Diamond Sharpening Rod
Navaris£15.434.4★2,638 rev
Vogue Diamond Knife Sharpening Steel 25.5 cm/10 inch Black Material: Diamond Steel Microcrystalline Surface Produces Precise Sharp Results Rockwell 99 degree Hardness Rating CC199
Vogue£10.664.5★155 rev
Newest
by launch date
Diamond Sharpening Steel - 12 inch Knife Sharpener Professional Sharpening Steel for Kitchen Knife Cooking Knifes Butchers and Japanese Knifes
Harnovlis£11.639 rev
SINJEUN 2 PCS Diamond Sharpening Steel 12 Inch Black Handle Knife Honing Steel for Edge Maintenance Professional Home Use
SINJEUN£13.243 rev
Diamond Sharpening Steel 12 (31cm) - Diamond Knife Sharpener Professional Kitchen Knife Sharpener Knife Sharpener Rod Cooking Knives Butchers Knives Home Gourmet Blades
GALLOP£12.6823 rev
Kimura Professional Diamond Honing Steel 10 inch Honing Rod Diamond Knife Sharpener Magnetized Steel Ergonomic Polypropylene Handle Ideal for Chef Knives Japanese Gift Box
Kimura£22.28156 rev
MITSUMOTO SAKARI 10 Inch Japanese Knife Sharpening Rod Flat Honing Steel
MITSUMOTO SAKARI£53.44208 rev
Trending
90-day click momentumDiamond Sharpening Steel - 12 inch Knife Sharpener Professional Sharpening Steel for Kitchen Knife Cooking Knifes Butchers and Japanese Knifes
Harnovlis£11.634.8★
Diamond Sharpening Steel - 12 inch Knife Sharpener for Master Chef Ideal for Kitchen Knife Cooking Knife Butchers and Japanese Knife Home Gourmet Blade Sharpening Stick
W WITHLENT£12.974.4★
Victorinox Diamond Wetzahl 26 0 cm Black 7.8323
Victorinox£42.554.5★
Kimura Professional Diamond Honing Steel 10 inch Honing Rod Diamond Knife Sharpener Magnetized Steel Ergonomic Polypropylene Handle Ideal for Chef Knives Japanese Gift Box
Kimura£22.284.7★
MITSUMOTO SAKARI 10 Inch Japanese Knife Sharpening Rod Flat Honing Steel
MITSUMOTO SAKARI£53.444.4★
What buyers say about diamond knife sharpener
What buyers praise and complain about, mined from review topics.What buyers love
“Keep things sharp”
“Good quality”
“Great deal”
“Easy to use”
“As advertised”
“After this years my mate keep using it being quite durable”
“Knives sharpen quickly”
“Works perfectly”
“The two in one design is really useful”
“with a comfortable handle that gives good control”
What buyers complain about
“Not for professional use doesn't last long enough”
“it's a truly garbage product”
“Our previous one of 42 years got rusty”
“Complete waste of money”
“Rather plasticky handle”
Top return reasons
Common questions
- Is diamond knife sharpener profitable to sell on Amazon United Kingdom?
- The niche generates £55K/yr across 14 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -19.6%. Flapen's verdict: Worth a look (50/100).
- How competitive is the diamond knife sharpener niche?
- 12 brands and 26 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 80% of demand.
- What do buyers complain about in diamond knife sharpener?
- Top complaints mined from reviews: Durability, Quality-Overall, Rusts/Corrodes. The return rate is 0.6%.
- When does demand for diamond knife sharpener peak?
- Demand peaks in Sep–Oct–Nov–Dec; the busiest month runs 4.6× the quietest.
- What does it cost to enter the diamond knife sharpener niche?
- Listings span £10.66–£53.44; the average listing price is £20.98 (sweet spot $15–$100). The average incumbent carries 614 reviews — the moat a new listing must climb.