---
title: "Reviews — diamond sharpening stone - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/diamond-sharpening-stone/reviews"
last_updated: "2026-08-09T00:28:24.387Z"
locale: en
meta:
  description: "Niche score 57/100 · $796K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 57/100 · $796K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Reviews — diamond sharpening stone - Flapen"
---

# **diamond sharpening stone**

**Worth a look**

Shows a sweet-spot price point ($34.97 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 73Growth 24Conversion 41Competition 75Returns 93Price range 54Avg price 95Brand share 48Review moat 25Quality gap 38

**Avg price**

**Incredible****$34.97**

avg listing price — sweet spot $15–$100

**Returns**

**Great****1.1%**

return rate — above 5% kills the launch gate

**Competition**

**Great****40%**

top-5 click share — an open shelf

**Market size**

**Good****$796K**

$796K/yr · 694K searches

**Price range**

**Good****$7.92–$164.45**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Brand share**

**Okay****76%**

top-5 brand share — brands hold most of the demand

**Conversion**

**Okay****3.3%**

search→purchase rate — share of searches ending in a sale

**Quality gap**

**Okay****4.5★**

avg incumbent rating — lower means beatable quality

**Review moat**

**Bad****4,185.02**

avg incumbent reviews — the moat a new listing must climb

**Growth**

**Bad****-1.8%**

90-day search growth — must beat 0% to launch

## Reviews