Diamond Tester
FailThe top 5 products take 86% of clicks, so Diamond Tester is a Fail.
- Flapen Score
- 45 / 100Ranks 2,538 of 4,656 Arts, Crafts & Sewing niches · −1 vs the category median of 4645
- Market size
- $1.3M/yr928K searches / yr
- 90-day growth
- -4.4%search demand this quarter
- Competition
- 86%top-5 click share · 9 brands · 12 sellers
Flapen Score
Diamond Tester against its category
The dotted line is the Arts, Crafts & Sewing average. Past it, Diamond Tester is stronger. Inside it, weaker.
Market
The Diamond Tester market on Amazon at a glance
Shoppers on Amazon United States searched for Diamond Tester 928K times last year and spent an estimated $1.3M. The top 5 brands take 88% of clicks. Flapen scores it 45 out of 100, a Fail.
01 · Demand
An estimated 3.3% of those searches ended in a purchase.
Shoppers searched for this 928K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 3.3% of those searches ended in a purchase. Searches in the last 90 days moved -4.4% against the 90 days before. Searches, conversion and average price together put the market at an estimated $1.3M a year.
- Searches, last 12 months
- 928K
- Growth, 90 days vs prior 90
- -4.4%
- Conversion, latest week
- 3.3%
- Market size, estimated
- $1.3Ma year
- Peak month
- February1.4× the quietest month
- Top search term
- diamond tester593K searches a year
02 · Price
A sale here is worth $41.43.
Listings sell for $41.43 on average, from $9.04 to $238.49. Amazon reports units sold in ranges. This niche sold 50K to 60K a year. The average listing sells 6,000 to 8,000 of them. At $41.43 that is $249K to $331K a year per listing.
- Average price
- $41.43inside the $15 to $100 sweet spot
- Price range
- $9.04–$238.49
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 50K–60K
- Units per listing a year
- 6,000–8,000
- Revenue per listing a year
- $249K–$331K
- Returns
- 5.5%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
90% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #10 within Jewelry Making Tools & Accessories. It carries 1,873 reviews at 3.94 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 90%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #10in Jewelry Making Tools & Accessories
- Average rating
- 3.94 starsAmazon United States average 4.42 stars
- Average reviews
- 1,873per listing
- Listings tracked
- 10
04 · Newcomers
1 of last year's 2 launches cleared the first-year sales bar.
2 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 41 months on average, so the names here are settling in.
- Launched, last 12 months
- 2
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 41 months
Products
Top Diamond Tester products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 6, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
HMKIS Diamond Tester Pen with 60X Jewelry Loupe (Non-Rechargeable)
- Price
- $16.94
- Rating
- 4.0/5
- Reviews
- 8,496
- Age
- 5y ago

Diamond Tester High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)
- Price
- $14.99
- Rating
- 4.0/5
- Reviews
- 7,597
- Age
- 9y ago

Siziviki Diamond Tester Pen Pro High Accuracy Jewelers Diamond Detector
- Price
- $10.63
- Rating
- 4.0/5
- Reviews
- 1,109
- Age
- 4y ago

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included
- Price
- $32.74
- Rating
- 4.2/5
- Reviews
- 262
- Age
- 1y ago

Diamond Tester Pen High Accuracy Jewelry Tester Battery Included Gemstone-Only Detection - No Metal/Gold Testing for Novice and Expert Gemologists
- Price
- $9.04
- Rating
- 3.6/5
- Reviews
- 51
- Age
- 4mo ago
Trending
estimated 90-day click momentum
Jewelry Diamond Tester Pen Professional Tool with Magnifier & Battery
- Price
- $14.09
- Rating
- 3.7/5
- Reviews
- 31
- Age
- 2mo ago

Diamond Tester Pen High Accuracy Jewelry Tester Battery Included Gemstone-Only Detection - No Metal/Gold Testing for Novice and Expert Gemologists
- Price
- $9.04
- Rating
- 3.6/5
- Reviews
- 51
- Age
- 4mo ago

Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE
- Price
- $38.51
- Rating
- 4.3/5
- Reviews
- 760
- Age
- 3y ago

GemOro UltraTester 3+ Diamond Tester | Test Diamond Moissanite White Sapphire Gemstone | Precision Tool with Expert Professional Reading & Accuracy
- Price
- $238.49
- Rating
- 3.8/5
- Reviews
- 212
- Age
- 15y ago

Diamond Tester High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)
- Price
- $14.99
- Rating
- 4.0/5
- Reviews
- 7,597
- Age
- 9y ago
Newest
by launch date
Jewelry Diamond Tester Pen Professional Tool with Magnifier & Battery
- Price
- $14.09
- Rating
- 3.7/5
- Reviews
- 31
- Age
- 2mo ago

Diamond Tester Pen High Accuracy Jewelry Tester Battery Included Gemstone-Only Detection - No Metal/Gold Testing for Novice and Expert Gemologists
- Price
- $9.04
- Rating
- 3.6/5
- Reviews
- 51
- Age
- 4mo ago

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included
- Price
- $32.74
- Rating
- 4.2/5
- Reviews
- 262
- Age
- 1y ago

Diamond Tester Pen Jewelry Diamond Tester Pen+30X 60X Mini LED Magnifying Jewelry Eye Loupe Jewelry Distinguish Tool Professional Diamond Selector for Novice and Expert
- Price
- $23.00
- Rating
- 4.3/5
- Reviews
- 89
- Age
- 1y ago

Diamond Tester High Accuracy Diamond Tester Pen Environmental Protection 9V Battery Professional Diamond Selector for Jeweler Novice and Expert Thermal Conductivity Meter (Diamond Tester)
- Price
- $15.82
- Rating
- 3.5/5
- Reviews
- 122
- Age
- 1y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 86% of clicks. A locked shelf that new listings rarely crack.
Brands
9 rising
Sellers
12
Est. top-5 brand share
88%
Top 20: 100%
Est. top-5 click share
86%
Top 20: 100%
Open market
8%
- HMKIS40%
- Hqdz19%
- Siziviki14%
- Valkynos11%
- Marvelity4%
- GTE4%
- Open — no brand owns it (3 brands, 8%)
Demand
Diamond Tester search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.4×
Search terms
Top Diamond Tester search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- diamond tester593K/yr
- diamond tester pen112K/yr
- diamond tester professional39K/yr
- diamond detector21K/yr
- diamond tester for jewelry18K/yr
- dimond tester24K/yr
- moissanite tester19K/yr
- diamond and moissanite tester10K/yr
- diamond detector pen6K/yr
- diamond checker11K/yr
Reviews and returns
What reviews say buyers love and hate about Diamond Tester
We read the reviews and the return reasons for every product selling here.
“Low quality product”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Diamond Tester questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









