Diamond Tester Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Diamond Tester sales on Amazon US totaled 9,200 units in July 2026 (▲ 35.3% vs. the prior month), generating an estimated $340,298 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 88.0% of unit volume and 84.2% of revenue, while a typical listing is priced at $138.16. The keyword itself pulled 37,406 Amazon queries over the same period (▲ 1.4% MoM).
Zooming out to the 12-month window ending July 2026, the diamond tester Top 50 moved 88,100 units and $3,292,782 in cumulative sales — an average of 7,342 units and $274,398 per month. Monthly throughput topped out at 9,200 units in July 2026 and dipped to 4,050 in May 2026, leaving the latest reading 42.6% higher than August 2025.
Diamond Tester Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
9.2K
▲ 35.3% MoM
Monthly Revenue 2026/07
$340.3K
▲ 33.9% MoM
Top 10 Market Share 2026/07
88.0%
Diamond Tester Market Share & Sales Concentration on Amazon US — July 2026
The most-sold diamond tester listing on Amazon US in July 2026 is ASIN B08MTG5NHJ (Brand: HMKIS), which sold 3,000 units at $16.99 apiece — equal to 32.6% of every unit tracked in this report and 3.0× the volume of the No. 2 listing.
The Top 10 ASINs account for 8,100 units and $286,472 in July 2026 — 88.0% of unit volume and 84.2% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Diamond Tester' on Amazon
July 2026
Is 88.0% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
Powered by ASINSIGHT MCP · Grounded in ASINSIGHT Amazon data
Top 5 Volume Share breakdown
B08MTG5NHJ
HMKIS Diamond Tester Pen with 60X Jewelry Loupe (Non-Rechargeable) | Based on High Thermal Conductivity of Diamonds. Powered by USB or 9V Battery Diamond Selector for Novice and Expert
3K
▲ 50.0%vs. prior month
$51K
latest month
12-month trend
B06Y2MT175
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)
1K
▲ 0.0%vs. prior month
$15K
latest month
12-month trend
B0B5DHYMWX
Siziviki Diamond Tester Pen Pro High Accuracy Jewelers' Diamond Detector | Professional Jewelers Gem Tester, Jewelry-only Detection, High-precision Diamond Test, Portable Pen for Fast Gem Verification
1K
▲ 0.0%vs. prior month
$10K
latest month
12-month trend
B0BY3N4KBD
Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE
800
▲ 60.0%vs. prior month
$29.6K
latest month
12-month trend
B0F9PM2YGV
Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included
600
▲ 0.0%vs. prior month
$19.2K
latest month
12-month trend
B0FP3YLWKX
Gemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions, Digital Scale, Diamond Tester, Touchstone, and Accessories
600
▲ 50.0%vs. prior month
$36K
latest month
12-month trend
Unlock to view all Top 50 ASIN competitors and their sales contributions
Best Diamond Tester Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
HMKIS is the best-performing diamond tester brand in July 2026, moving 3,200 units across 2 ASINs for 39.5% of Top 10 volume. Hqdz follows with 1,000 units (12.3%), ahead of Siziviki on 1,000 units (12.3%).
With 9 brands splitting the Top 10 and 64.2% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $9.99 to $16.99, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
HMKIS
2 ASINs in Top 10
39.5%
Units
3.2K
Revenue
$54.4K
Avg. price
$16.99
B08MTG5NHJ
$16.99·★4.0·8.5K revsHMKIS Diamond Tester Pen with 60X Jewelry Loupe (Non-Rechargeable) | Based on High Thermal Conductivity of Diamonds. Powered by USB or 9V Battery Diamond Selector for Novice and Expert
Units sold3KB0F3JQB4FN
$16.99·★4.0·8.5K revsHMKIS Diamond Tester Pen with 60X Jewelry Loupe (Non-Rechargeable) | Operates Based on the High Thermal Conductivity of Diamonds. Diamond Selector for Novice and Expert (Non-Rechargeable)
Units sold200
Hqdz
1 ASIN in Top 10
12.3%
Units
1K
Revenue
$15K
Avg. price
$14.99
B06Y2MT175
$14.99·★4.0·7.6K revsDiamond 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)
Units sold1K
Siziviki
1 ASIN in Top 10
12.3%
Units
1K
Revenue
$10K
Avg. price
$9.99
B0B5DHYMWX
$9.99·★4.0·1.1K revsSiziviki Diamond Tester Pen Pro High Accuracy Jewelers' Diamond Detector | Professional Jewelers Gem Tester, Jewelry-only Detection, High-precision Diamond Test, Portable Pen for Fast Gem Verification
Units sold1K
Trending Diamond Tester Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. On the growth side, B0G6BPDHCZ leads positive momentum with ▲ 200.0% MoM growth on 300 units, with B0DTS53RMS close behind at ▲ 100.0% MoM on 200 units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0G6BPDHCZ
Diamond Tester Pen, High Accuracy Jewelry Tester, Battery Included, Gemstone-Only Detection - No Metal/Gold Testing, for Novice and Expert Gemologists
Price
$9.29
Rating
3.4
Reviews
47
Latest month sales
B0DTS53RMS
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
$14.99
Rating
3.4
Reviews
137
Latest month sales
B0F3JQB4FN
HMKIS Diamond Tester Pen with 60X Jewelry Loupe (Non-Rechargeable) | Operates Based on the High Thermal Conductivity of Diamonds. Diamond Selector for Novice and Expert (Non-Rechargeable)
Unlock to view ASIN details and product titles
Price
$16.99
Rating
4.0
Reviews
8.5K
Latest month sales
One Amazon dataset. Two ways to use it.
Every number in this diamond tester report comes from the Amazon market data ASINSIGHT tracks. Pick how you want to work with it.
Explore the full data
Browse the complete, structured picture in a ready-made interface — and keep tracking it as the market moves.
- Organic vs. ad traffic shifts per product
- Hourly rank and search-volume tracking
- Competitor ASINs and historical trends
Starts with a free ASINSIGHT account
Analyze the data your way
Connect the same data to ChatGPT, Claude or Cursor, then combine any dimensions to answer your own questions.
- Combine product, keyword, sales & ranking data freely
- Follow up in your own words, no fixed reports
- Works in ChatGPT, Claude & Cursor
20,000 credits/mo free, no credit card