---
title: "Diamond Sharpening Card — $173K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/diamond-sharpening-card"
last_updated: "2026-08-08T23:33:46.293Z"
locale: en
meta:
description: "Niche score 50/100 · $173K/yr market · 97K searches/yr. Brand-locked demand (top 5 brands take 97% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $173K/yr market · 97K searches/yr. Brand-locked demand (top 5 brands take 97% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Diamond Sharpening Card — $173K/yr Amazon US Niche (2026) - Flapen"
---
# **diamond sharpening card**
**Worth a look**
Shows a sweet-spot price point ($44.58 avg), but brand-locked demand (top 5 brands take 97% of clicks) keeps it on the watch list.
Market size 35Growth 24Conversion 50Competition 72Returns 89Price range 63Avg price 95Brand share 7Review moat 67Quality gap 42
**Avg price**
**Incredible****$44.58**
avg listing price — sweet spot $15–$100
**Returns**
**Great****1.3%**
return rate — above 5% kills the launch gate
**Competition**
**Good****42%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Good****835.23**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Good****$11.63–$146.76**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Good****4.0%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****$173K**
$173K/yr · 97K searches
**Growth**
**Bad****-1.1%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, diamond sharpening card is a $173K/yr Amazon United States market (97K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Jan–Dec. Verdict: Worth a look — 50/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diamond sharpening card market data**
- **Units sold / yr**
- **3K–4K**
- avg 0–100/product
- **Revenue / yr**
- **$134K–$178K**
- units × avg price
- **Conversion rate**
- **4.0%**
- **Avg BSR**
- **#1,082**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **56%**
- **Out of stock**
- **0.5%**
- **Avg brand age**
- **75 months**
- **Avg seller age**
- **171 days**
## **Competition & brand share**
The top 5 products take 42% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**8 **▲rising
**Sellers**
**111**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**42%**
Top 20: 82%
**Open market**
**2%**
- DMT (Diamond Machining Technology)73% - EZE-LAP12% - TREND6% - SHARPAL5% - Ultrasharp2% - Mysora1% - Open — no brand owns it (2 brands, 2%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -1.1% search growth over the last 90 days.
3K2KHoliday '24Prime Day '25Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan, Dec · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/diamond-sharpening-card/trend)
## **Top diamond sharpening card search terms**
- **dmt diamond sharpening stone**47K/yr+3.4%1.9% conv. - **dmt knife sharpener**9K/yr+28.1%2.1% conv. - **eze lap diamond stone**9K/yr-23.8%2.8% conv. - **dmt sharpening stone**8K/yr+10.9%1.4% conv. - **lapping fluid**4K/yr+0.7%9.2% conv. - **diamond sharpening card**4K/yr-14.8%5.0% conv. - **eze lap diamond sharpener**3K/yr+30.8%4.5% conv. - **router bit sharpener**4K/yr-22.9%1.4% conv. - **dmt sharpener**4K/yr-26.7%3.1% conv. - **eze-lap**2K/yr+9.9%2.8% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/diamond-sharpening-card/search-terms)
## **Top diamond sharpening card 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.
0%4%$7K8%$14K12%$21K16%$28K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**DMT D8F Dia-Sharp Bench Stone - Diamond Knife Sharpener for the Workshop Jobsite or Kitchen - Fine - Flat Diamond Sharpening - Non-Slip Knife Sharpener- Made in the USA - 8 x 3 x 0.38 Inches**DMT (Diamond Machining Technology)**$39.72**4.5★1,130 rev](https://www.amazon.com/dp/B0001WP1LK) [2**DMT FWFC DuoSharp Double-Sided Diamond Sharpening Stone for Knives and More 8-Inch Fine/Coarse White**DMT (Diamond Machining Technology)**$25.06**4.6★1,383 rev](https://www.amazon.com/dp/B00004WFTW) [3**DMT Deluxe Diamond Professional Knife Sharpening Kit - Includes Set of 3 Diamond Whetstone Blocks for Kitchen Knives Lawn Mower Blades Hunting/Butchery Tools and More - Comes in Natural Wood Box**DMT (Diamond Machining Technology)**$104.06**4.5★1,766 rev](https://www.amazon.com/dp/B003NCVFC4) [4**DMT D8C Dia-Sharp Bench Stone - Diamond Knife Sharpener for the Workshop Jobsite or Kitchen - Coarse (325) - Flat Diamond Sharpening - Non-Slip Knife Sharpener- Made in the USA - 8 x 3 x 0.38 Inches**DMT (Diamond Machining Technology)**$49.71**4.4★892 rev](https://www.amazon.com/dp/B0001WP1L0) [5**DMT DuoSharp Double-Sided Diamond Whetstone - Fine/Coarse (600/325) Diamond Sharpening Stone with Base - Tool Sharpener for Kitchen Garage Workshop Chisels Knives More - Made in USA 8 Inches**DMT (Diamond Machining Technology)**$75.79**4.6★672 rev](https://www.amazon.com/dp/B000H6MLOK)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Mysora Diamond Abrasive Lapping Fluid 3.4 fl oz (100 ml) Honing Oil for Diamond Stones & Knife Sharpening Precision Tip Applicator Prevents Clogging & Rust Improves Grinding Performance**Mysora**$11.63**9 rev5mo ago](https://www.amazon.com/dp/B0GL8VN673) [**SHARPAL 162N Double-sided Diamond Sharpening Stone 8 in. x 3 in.**SHARPAL**$66.98**6,988 rev7y ago](https://www.amazon.com/dp/B07GRWN1PV) [**SHARPAL 116N Pocket Diamond Sharpening Card**SHARPAL**$26.68**878 rev7y ago](https://www.amazon.com/dp/B07GLH82DP) [**DMT D8E Dia-Sharp Bench Stone - Diamond Knife Sharpener for the Workshop Jobsite or Kitchen - Extra Fine- Flat Diamond Sharpening - Non-Slip Knife Sharpener- Made in the USA - 8 x 3 x 0.38 Inches**DMT (Diamond Machining Technology)**$56.18**632 rev8y ago](https://www.amazon.com/dp/B0009H5C5M) [**Ultra Sharp Diamond Sharpening Stone Set - 8 x 3 Coarse/Medium/Extra Fine**Ultrasharp**$138.16**1,122 rev10y ago](https://www.amazon.com/dp/B01FPP46W2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Mysora Diamond Abrasive Lapping Fluid 3.4 fl oz (100 ml) Honing Oil for Diamond Stones & Knife Sharpening Precision Tip Applicator Prevents Clogging & Rust Improves Grinding Performance**Mysora**$11.63**4.8★**▲ 210%**](https://www.amazon.com/dp/B0GL8VN673) [**Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card Extra Fine Fine & Coarse 3 Pack**DMT (Diamond Machining Technology)**$24.48**4.6★**▲ 45%**](https://www.amazon.com/dp/B00006IIO3) [**DMT (Diamond Machining Technology) 6-inch Diamond Whetstone Sharpening Stone with Plastic Case - Coarse W6CP**DMT (Diamond Machining Technology)**$38.36**4.6★**▲ 39%**](https://www.amazon.com/dp/B00004WFU8) [**DMT D8F Dia-Sharp Bench Stone - Diamond Knife Sharpener for the Workshop Jobsite or Kitchen - Fine - Flat Diamond Sharpening - Non-Slip Knife Sharpener- Made in the USA - 8 x 3 x 0.38 Inches**DMT (Diamond Machining Technology)**$39.72**4.5★**▲ 28%**](https://www.amazon.com/dp/B0001WP1LK) [**EZE-LAP EZLPACK-BRK Diamond Sharpener Set Asst**EZE-LAP**$20.66**4.5★**▲ 25%**](https://www.amazon.com/dp/B000UVS62S)
**~~View all trending →~~**
## **What buyers say about diamond sharpening card**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sharpness**24%
*“Sharp tools”*
**Quality-Overall**16%
*“Long lasting quality”*
**Value For Money**12%
*“For the price”*
**Durability**8%
*“extremely durable”*
**Ease Of Use**6%
*“Very easy to use”*
**Advertised Vs Actual Product**5%
*“works as advertised”*
**Precision Of Cut**4%
*“Works well to get a sharp blade”*
**Efficiency**2%
*“Works very well”*
**Ease Of Cleaning**2%
*“It keeps the diamond stone cleaner”*
**Size-Overall**2%
*“I really like this little stone because it's so small”*
### **What buyers complain about **
**Sharpness**16%
*“You cant get it razor sharp”*
**Quality-Overall**15%
*“Horrible quality”*
**Durability**14%
*“Lack Durability”*
**Material Quality**6%
*“Very poor quality plastic”*
**Value For Money**5%
*“way over priced”*
**Size-Overall**3%
*“it would not fit”*
**Rusts/Corrodes**3%
*“the medium grit blue block started to rust within an hour”*
**Functionality-Overall**2%
*“It is not working”*
**Product Condition**2%
*“at that I recall ordering a NEW ITEM not used”*
**Weight Heavy**2%
*“is quite heavy”*
### **Top return reasons **
**Sharpness**29%
**Size-Overall**14%
**Functionality-Overall**9%
**Advertised Vs Actual Product**9%
**Product Condition**9%
**Value For Money**8%
**Quality-Overall**5%
**Defective Material/Parts**3%
**Durability**2%
**Rusts/Corrodes**2%
## **Common questions**
- **Is diamond sharpening card profitable to sell on Amazon United States?**
- The niche generates $173K/yr across 39 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -1.1%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the diamond sharpening card niche?**
- 8 brands and 111 sellers compete. The top 5 products take 42% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in diamond sharpening card?**
- Top complaints mined from reviews: Sharpness, Quality-Overall, Durability. The return rate is 1.3%.
- **When does demand for diamond sharpening card peak?**
- Demand peaks in Jan–Dec; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the diamond sharpening card niche?**
- Listings span $11.63–$146.76; the average listing price is $44.58 (sweet spot $15–$100). The average incumbent carries 835 reviews — the moat a new listing must climb.
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