diamond sharpening stone
Worth a lookShows a sweet-spot price point ($34.97 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Avg price
Incredible$34.97avg listing price — sweet spot $15–$100
Returns
Great1.1%return rate — above 5% kills the launch gate
Competition
Great40%top-5 click share — an open shelf
Market size
Good$796K$796K/yr · 694K searches
Price range
Good$7.92–$164.45cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Conversion
Okay3.3%search→purchase rate — share of searches ending in a sale
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Bad4,185.02avg incumbent reviews — the moat a new listing must climb
Growth
Bad-1.8%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, diamond sharpening stone is a $796K/yr Amazon United States market (694K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in Jan–Dec. Verdict: Worth a look — 57/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
diamond sharpening stone market data
- Units sold / yr
- 20K–25K
- avg 500–750/product
- Revenue / yr
- $699K–$874K
- units × avg price
- Conversion rate
- 3.3%
- Avg BSR
- #347
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 52 months
- Avg seller age
- 166 days
Competition & brand share
Clicks spread well past the top 5 (40% combined) — an open shelf where new products get seen.Brands
20 rising
Sellers
89
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
40%
Top 20: 74%
Open market
21%
- SHARPAL49%
- DMT (Diamond Machining Technology)13%
- KITANIS6%
- S SATC6%
- Okxiri3%
- Jewboer3%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -1.8% search growth over the last 90 days.Peak months: Jan, Dec · busiest ÷ quietest = 1.9×
Top diamond sharpening stone search terms
- diamond sharpening stone180K/yr
- sharpal82K/yr
- diamond knife sharpener70K/yr
- sharpal diamond sharpening stone53K/yr
- dmt diamond sharpening stone47K/yr
- diamond sharpening plate42K/yr
- diamond stone31K/yr
- sharpal knife sharpener32K/yr
- diamond sharpening stones27K/yr
- diamond sharpener24K/yr
Top diamond sharpening stone 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
SHARPAL 162N Double-sided Diamond Sharpening Stone 8 in. x 3 in.
SHARPAL$66.984.7★6,988 rev
SHARPAL 156N Double-sided Diamond Sharpening Stone 6 in. x 2.5 in.
SHARPAL$42.974.7★6,988 rev
S SATC Diamond Sharpening Stone 2 Side Grit 400/1000 Diamond Plate Honing Stone 8-inch Hone Sharpener White
S SATC$21.204.6★2,206 rev
SHARPAL 202H Precision Knife Sharpening System Adjustable Angle 1035
SHARPAL$164.454.7★454 rev
SHARPAL 168H Large 8 x 3 Dual-Grit Diamond Sharpening Stone
SHARPAL$43.424.7★498 rev
Newest
by launch dateSHARPAL 202H Precision Knife Sharpening System Adjustable Angle 1035
SHARPAL$164.45454 rev
5 PCS Diamond Sharpening Stone Diamond Sharpening Plate
Okxiri$12.48161 rev
SHARPAL 168H Large 8 x 3 Dual-Grit Diamond Sharpening Stone
SHARPAL$43.42498 rev
SHARPAL 169H Large 8 x 3 Dual-Grit Diamond Sharpening Stone
SHARPAL$43.16288 rev
Double-sided Diamond Sharpening Stone Knife Sharpening Stone with Extra Fine 1200/Coarse 400 Grit Diamond Plate Storage Case with Non-Slip Base & Angle Guide(7 x 3.5 Inch)
KITANIS$14.5553 rev
Trending
90-day click momentumDouble-sided Diamond Sharpening Stone Knife Sharpening Stone with Extra Fine 1200/Coarse 400 Grit Diamond Plate Storage Case with Non-Slip Base & Angle Guide(7 x 3.5 Inch)
KITANIS$14.554.7★
Diamond Sharpening Stone 5 Pcs Knife Sharpening Stone for Kitchen Sharpening Diamond Lapping Plate Coarse/Medium/Fine Grit Sharpener 320/600/1000/2000/3000 Grit
ceilyweli$15.324.4★
SHARPAL 202H Precision Knife Sharpening System Adjustable Angle 1035
SHARPAL$164.454.7★
2 Pcs 400/600 Grit Portable Handheld Double Sided Sharpener Pocket Diamond Knife Sharpening Stone for Kitchen Garden Outdoor tools Fine/Coarse Grinding Black/Orange
XILEWHZF$10.064.6★
SHARPAL 129N Multipurpose Garden Tool Blade Sharpener
SHARPAL$10.904.4★
What buyers say about diamond sharpening stone
What buyers praise and complain about, mined from review topics.What buyers love
“Sharp Knifes”
“Stones appear to be of good quality”
“Great Deal”
“Easy to use”
“As advertised”
“Compact and durable”
“It works”
“Fast cutting, excellent for sharpening blades”
“They are a nice convenient size”
“sturdy and easy to use”
What buyers complain about
“does not sharpen very well if any”
“Bad quality”
“Lack Durability”
“Bigger than I thought it would be”
“Doesn't seem to work well for me”
“way over priced”
“Not great, hard to use”
“Very poor quality plastic”
“Mine did not include instructions”
“They can rust though”
Top return reasons
Common questions
- Is diamond sharpening stone profitable to sell on Amazon United States?
- The niche generates $796K/yr across 41 tracked products. 2 of 4 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Worth a look (57/100).
- How competitive is the diamond sharpening stone niche?
- 20 brands and 89 sellers compete. The top 5 products take 40% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in diamond sharpening stone?
- Top complaints mined from reviews: Sharpness, Quality-Overall, Durability. The return rate is 1.1%.
- When does demand for diamond sharpening stone peak?
- Demand peaks in Jan–Dec; the busiest month runs 1.9× the quietest.
- What does it cost to enter the diamond sharpening stone niche?
- Listings span $7.92–$164.45; the average listing price is $34.97 (sweet spot $15–$100). The average incumbent carries 4,185 reviews — the moat a new listing must climb.