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Diamond Tester

Maybe

The products selling today average only 3.8★. But shoppers spend only $50K a year here, so Diamond Tester is a Maybe.

Flapen Score
50
50 / 100
Top 43% of 2,225 DIY & Tools niches · +1 vs the category median of 49
Market size
£50K/yr54K searches / yr
90-day growth
-23.4%search demand this quarter
Competition
61%top-5 click share · 16 brands · 25 sellers

Flapen Score

Diamond Tester against its category

The dotted line is the DIY & Tools average. Past it, Diamond Tester is stronger. Inside it, weaker.

50Maybe
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Diamond Tester market on Amazon at a glance

Shoppers on Amazon United Kingdom searched for Diamond Tester 54K times last year and spent an estimated £50K. The top 5 brands take 63% of clicks. Flapen scores it 50 out of 100, a Maybe.

01 · Demand

6.4% of searches ended in a purchase last week.

Shoppers searched for this 54K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. In the latest week, 6.4% of those searches ended in a purchase. Searches in the last 90 days moved -23.4% against the 90 days before. Searches, conversion and average price together put the market at an estimated £50K a year.

Searches, last 12 months
54K
Growth, 90 days vs prior 90
-23.4%
Conversion, latest week
6.4%
Market size, estimated
£50Ka year
Top search term
diamond tester41K searches a year

02 · Price

A sale here is worth £14.58.

Listings sell for £14.58 on average, from £6.35 to £55.37. Amazon reports units sold in ranges. This niche sold 3K to 4K a year. The average listing sells 100 to 250 of them. At £14.58 that is £1K to £4K a year per listing.

Average price
£14.58under the $15 to $100 sweet spot
Price range
£6.35–£55.37
Amazon United Kingdom median price
£12.12across 27,606 niches
Units sold a year
3K–4K
Units per listing a year
100–250
Revenue per listing a year
£1K–£4K
Returns
3.4%of orders · Amazon United Kingdom median 0.6%

03 · Entry bar

The bar here is ads.

94% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 16.4% of listings are out of stock. The average listing ranks #232 within Electrical. It carries 246 reviews at 3.75 stars, so a new listing needs social proof before a better product.

Sponsored listings
94%
Prime listings
100%
Out of stock, average day
16.4%
Average rank
#232in Electrical
Average rating
3.75 starsAmazon United Kingdom average 4.36 stars
Average reviews
246per listing
Listings tracked
18

04 · Newcomers

Amazon counts 0 of last year's 8 launches as successful.

8 products launched here in the last 12 months. Amazon counts 0 of them as successful launches, new products that hit its first-year sales bar. The brands on the shelf have sold for 40 months on average, so the names here are settling in.

Launched, last 12 months
8
Successful launches
0Amazon's first-year sales bar
Average brand age
40 months

Products

Top Diamond Tester products & what they sell for

Every tracked product: its share of the shelf, its reviews, and its price.

Competition

Competition: brands, sellers & click share

The top 5 products take 61% of clicks. Leaders hold, but buyers still shop past them.

£0£5K£10K£15K£20K1101001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

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%

Demand

Diamond Tester search demand

Weekly searches over the year. Pick a range.

1K750Feb '26Mar '26Mar '26Apr '26May '26Jun '26

Search terms

Top Diamond Tester search terms shoppers use

The exact words shoppers type, with yearly volume, growth, and conversion.

  • diamond tester41K/yr
  • diamond tester professional9K/yr
  • diamond tester pen3K/yr

Reviews and returns

What reviews say buyers love and hate about Diamond Tester

What buyers praise, what they complain about and why they send it back, from the reviews.

Complain

Instructions/User Manual/Troubleshooting25%−0.16

But I have to say that the instructions could really offer better advice

The only disappointment is theres no instructions on how to test other gemstones as claimed it does

not clear instructions

Quality-Overall21%−0.20

Very badly made

Rubbish

rubbish

Defective Material/Parts8%−0.09

Faulty

Functionality-Overall8%−0.09

Did not work

Does not work

Strength8%−0.09

Very erratic similar to how previous similar models end up after 6 months use

Love

Efficiency31%+1.94

Works well

It works good

Okay, that's working fine, tested

Ease Of Use18%+1.57

Works brilliant and easy to use

Its very straightforward to calibrate

Excellent to use

Quality-Overall15%−0.20

Good quality

Good item, mostly reliable and easy to use

in good quality

Value For Money14%+0.62

is incredibly affordable

Good value for money

Good for the price

Advertised Vs Actual Product8%+0.72

perfect worked as it should

Return

3.4% Return rate 5% Fixable by listing

Functionality-Overall52%██▇▇▇▇

Did not work

Does not work

Defective Material/Parts9%▄▅▆█▂▆

Faulty

Quality-Overall7%▄▁▆▁█▂

Very badly made

Rubbish

rubbish

Instructions/User Manual/Troubleshooting7%▅▁▇▁█▃

But I have to say that the instructions could really offer better advice

The only disappointment is theres no instructions on how to test other gemstones as claimed it does

not clear instructions

Measurement/Reading Accuracy5%█▁▃▄▃▄

FAQ

Common Diamond Tester questions

Answered from the same tracked data.