Diamond Tester
Diamond Tester shows beatable incumbent ratings (3.8★), but a small market ($50K/yr) keeps it on the watch list.
Flapen Score
Is Diamond Tester profitable on Amazon?
According to Flapen's Amazon United Kingdom niche tracking, Diamond Tester is a £50K/yr Amazon United Kingdom market (54K searches/yr). The top 5 brands hold 63% of demand. Verdict: Worth a look — 50/100.
Diamond Tester: the Amazon niche in one read
Everything a seller checks before entering, in three answers.
Is the demand real?
Worth a look. Search demand moved -23.4% over the last 90 days and 6.4% of searches end in a purchase.
£50K
revenue / yr
Who owns the niche?
The top 5 brands hold 63% of demand, so 37% of the market is open.
37%
open market share
Is there a way in?
Listing quality. The average product page scores 0/100 on content standards. Incumbents average 3.8★ — the gap to enter on.
0/100
page quality · 18 products
Top Diamond Tester products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Top sellers
by 90-day click share
JZK Portable Electronic Diamond Tester Pen for Diamond Sapphire Ruby Crystal Agate Jade gems Multi Gemstone Precious Stones Hardness Test Tool Diamond Selector II V2
- Price
- £10.58
- Rating
- 4.0/5
- Reviews
- 2,811
- Age
- 8y ago
QWORK Electronic Diamond Tester Portable Electronic Gemstone Tester Pen for Diamonds Sapphire Ruby Crystal Agate Jade
- Price
- £8.57
- Rating
- 4.0/5
- Reviews
- 64
- Age
- 1y ago
Portable Electronic Diamond Tester Pen Professional Moissan Diamond Tester High Accuracy Jewelry Detector for Diamond Jade Ruby Crystal Sapphire Agate gems Multi Gemstone Precious
- Price
- £8.10
- Rating
- 3.9/5
- Reviews
- 19
- Age
- 11mo ago
Portable Electronic Diamond Tester Pen High Accuracy Jewelry Diamond Selector Detector with 2Pcs 30X 60X Mini Led Foldable Magnifying for Novice Expert
- Price
- £15.72
- Rating
- 3.9/5
- Reviews
- 120
- Age
- 2y ago
Electronic Diamond Tester Pen Portable Professional Jewelry Gemstone Testing Tool for Diamond Sapphire Ruby Crystal Agate Jade gems Multi Gemstone Precious Stones with LED Light and Audio Indicator
- Price
- £7.67
- Rating
- 2.9/5
- Reviews
- 10
- Age
- 6mo ago
Trending
90-day click momentum
Portable Electronic Diamond Tester Pen Kit Electronic Gemstone Detector
- Price
- £9.27
- Rating
- 3.0/5
- Reviews
- 1
- Age
- 1mo ago
Portable Electronic Diamond Tester Pen High Accuracy Moissan Diamond Jewelry Detector Stones Hardness Testing Gemstone Selector Tool for Sapphire Ruby Agate Jade Crystal Multi Gems
- Price
- £7.91
- Rating
- 4.7/5
- Reviews
- 4
- Age
- 3mo ago
Portable Electronic Diamond Tester Pen Professional Moissan Diamonds Tester High Accuracy Jewelry Detector with LED Light for Diamond Jade Ruby Crystal Sapphire Agate gems Multi Gemstone Precious
- Price
- £7.26
- Rating
- 4.0/5
- Reviews
- 2
- Age
- 3mo ago
Portable Electronic Diamond Tester Pen High Accuracy Jewelry Detector Moissan Tester Professional Testing Diamond Gems Tool for gems Multi Gemstone Precious Jade Ruby Crystal Sapphire Agate
- Price
- £7.28
- Rating
- 2.5/5
- Reviews
- 2
- Age
- 6mo ago
Portable Electronic Diamond Tester Pen High Accuracy Jewelry Diamond Selector Detector with 2Pcs 30X 60X Mini Led Foldable Magnifying for Novice Expert
- Price
- £15.72
- Rating
- 3.9/5
- Reviews
- 120
- Age
- 2y ago
Newest
by launch datePortable Electronic Diamond Tester Pen Kit Electronic Gemstone Detector
- Price
- £9.27
- Rating
- 3.0/5
- Reviews
- 1
- Age
- 1mo ago
Portable Electronic Diamond Tester Pen High Accuracy Moissan Diamond Jewelry Detector Stones Hardness Testing Gemstone Selector Tool for Sapphire Ruby Agate Jade Crystal Multi Gems
- Price
- £7.91
- Rating
- 4.7/5
- Reviews
- 4
- Age
- 3mo ago
Portable Electronic Diamond Tester Pen Professional Moissan Diamonds Tester High Accuracy Jewelry Detector with LED Light for Diamond Jade Ruby Crystal Sapphire Agate gems Multi Gemstone Precious
- Price
- £7.26
- Rating
- 4.0/5
- Reviews
- 2
- Age
- 3mo ago
Electronic Diamond Tester Pen Portable Professional Jewelry Gemstone Testing Tool for Diamond Sapphire Ruby Crystal Agate Jade gems Multi Gemstone Precious Stones with LED Light and Audio Indicator
- Price
- £7.67
- Rating
- 2.9/5
- Reviews
- 10
- Age
- 6mo ago
Electronic Diamond Tester Pen Professional Moissan Diamond Jewelry Detector Portable Gemstone Selector Tool for Sapphire Ruby Crystal Agate Jade Gems Precious Hardness Test Tool High Accuracy II V2
- Price
- £7.77
- Rating
- 2.7/5
- Reviews
- 4
- Age
- 6mo ago
Competition: brands, sellers & click share
The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.
Brands
16 flat
Sellers
25
Top-5 brand share
63%
Top 20: 100%
Top-5 click share
61%
Top 20: 100%
Open market
31%
- JZK21%
- QWORK15%
- Vakler10%
- luolety10%
- DUSEKI7%
- NIUPIKA6%
Diamond Tester demand & seasonality
Weekly search volume, with the niche's key stats alongside.
Top Diamond Tester search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.
- diamond tester41K/yr
- diamond tester professional9K/yr
- diamond tester pen3K/yr
What reviews say buyers love and hate about Diamond Tester
What buyers mention most, as a share of all reviews.
What buyers love
96% of reviews“Works well”
“Works brilliant and easy to use”
“Good quality”
“is incredibly affordable”
“perfect worked as it should”
What buyers complain about
96% of reviews“But I have to say that the instructions could really offer better advice”
“Very badly made”
“Faulty”
“Did not work”
“Very erratic similar to how previous similar models end up after 6 months use”
Diamond Tester return rate & reasons
Why buyers send it back, as a share of all return requests.
3.4%
Return rate
5%
Fixable by listing
The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.
Common Diamond Tester questions
The questions sellers ask about this niche, answered from the tracked metrics.
Related niches
Same-category niches scoring near this one — the next ones worth researching.
Best Flapen score
The highest-scoring niches we track right now, across every category.
