presidium gem tester
Skip itSoft demand (-12.7% this quarter) — this niche doesn't clear our bar today.
Quality gap
Great4.0★avg incumbent rating — lower means beatable quality
Avg price
Good$119.65avg listing price — sweet spot $15–$100
Market size
Good$602K$602K/yr · 228K searches
Review moat
Good1,073.2avg incumbent reviews — the moat a new listing must climb
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Competition
Okay57%top-5 click share — leaders hold, buyers still browse
Conversion
Okay2.2%search→purchase rate — share of searches ending in a sale
Returns
Bad5.5%return rate — above 5% kills the launch gate
Price range
Bad$10.78–$409.83cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-12.7%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, presidium gem tester is a $602K/yr Amazon United States market (228K searches/yr). The top 5 brands hold 76% of demand. Verdict: Skip it — 46/100.
Data updated Jul 6, 2026 · scored weekly · How we score niches
presidium gem tester market data
- Units sold / yr
- 4K–5K
- avg 100–250/product
- Revenue / yr
- $479K–$598K
- units × avg price
- Conversion rate
- 2.2%
- Avg BSR
- #87
- Page quality
- 0%
- Prime
- 90%
- Sponsored
- 75%
- Out of stock
- 0.8%
- Avg brand age
- 51 months
- Avg seller age
- 175 days
Competition & brand share
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.Brands
13 falling
Sellers
26
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
57%
Top 20: 100%
Open market
20%
- Presidium43%
- TEKCOPLUS10%
- HMKIS10%
- GTE6%
- Siziviki6%
- Gemtone5%
Demand & seasonality
Weekly Amazon search volume, last 109 weeks — -12.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top presidium gem tester search terms
- gem tester44K/yr
- presidium gem tester38K/yr
- gem tester for all stones35K/yr
- gemstone tester35K/yr
- gemstone tester for all stones15K/yr
- presidium gem tester ii12K/yr
- gem tester for all stones and metal10K/yr
- presidium10K/yr
- presidium multi tester iii4K/yr
- presidium diamond tester4K/yr
Top presidium gem tester products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 20 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones
Presidium$284.144.2★1,359 rev
HMKIS Diamond Tester Pen with 60X Jewelry Loupe Magnifier
HMKIS$16.964.1★8,410 rev
Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE
GTE$37.934.3★739 rev
Siziviki Diamond Tester Pen Pro High Accuracy Jewelers Gemstone Detector
Siziviki$10.784.1★1,016 rev
Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds Rubies Sapphires Aquamarine Glass Filter Reliable Portable Ideal for Gemologists and Jewelers
TEKCOPLUS$21.684.1★110 rev
Newest
by launch date
Gemtone All-in-One Gold Silver Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions Digital Scale Diamond Tester Touchstone and Accessories
Gemtone$56.26199 rev
Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included
Valkynos$33.16222 rev
Professional Diamond Tester Pen High Accuracy Jewelry Diamond Tester Electronic Diamond Gem Tester and Tester Pen 60X Magnifying Glasses Tool Kit for Novice Expert (Diamond Tester Pen)
Hqdz-td$19.73186 rev
Portable Gem Tester Gemstone Tester with LED Indicator Light & Touch Screen Accurate Test and Easy to Read No Calibration Needed and Easy to Carry Gemstone Tester for All Diamond
JYCWTT$55.736 rev
KooingTech Diamond Tester Jewelry Refractometer RHG181 1.30-1.81
KooingTech$76.6718 rev
Trending
90-day click momentum
Presidium Diamond Mate A (PDMT-A) Diamond Tester | Professional Handheld Diamond Authenticity Tester | Thermal Conductivity Diamond & Simulant Testing Tool with Metal Alert & Low Battery Indicator
Presidium$127.304.0★
Gemtone All-in-One Gold Silver Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions Digital Scale Diamond Tester Touchstone and Accessories
Gemtone$56.264.4★
KooingTech Diamond Tester Jewelry Refractometer RHG181 1.30-1.81
KooingTech$76.674.7★
Diamond Tester Jewelry Gem Stone Tester Kit Professional 2-in-1 Tester for Diamonds Moissanite Metals and Gemstones
TEKCOPLUS$103.403.8★
Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds Rubies Sapphires Aquamarine Glass Filter Reliable Portable Ideal for Gemologists and Jewelers
TEKCOPLUS$21.684.1★
What buyers say about presidium gem tester
What buyers praise and complain about, mined from review topics.What buyers love
“Easy to handle”
“If you're looking for something reliable, well-made, and at a fair price point, this is the perfect choice”
“Good for the money”
“Exactly what I need”
“The diamond tester works fine”
“Simple instructions and easy to use”
“I love how lightweight it is”
“can be carried around conveniently”
“Its made very durable”
“Great light”
What buyers complain about
“Cheap quality”
“Not even functional”
“poor durability”
“.Little on the pricey side”
“diamond tester with no manual”
“Accuracy was not perfect”
“is not convenient to use”
“Short battery life”
“Did I receive a defective product”
“Not accurate as described”
Top return reasons
Common questions
- Is presidium gem tester profitable to sell on Amazon United States?
- The niche generates $602K/yr across 20 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -12.7%. Flapen's verdict: Skip it (46/100).
- How competitive is the presidium gem tester niche?
- 13 brands and 26 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in presidium gem tester?
- Top complaints mined from reviews: Quality-Overall, Functionality-Overall, Durability. The return rate is 5.5% — above our launch gate.
- When does demand for presidium gem tester peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the presidium gem tester niche?
- Listings span $10.78–$409.83; the average listing price is $119.65 (sweet spot $15–$100). The average incumbent carries 1,073 reviews — the moat a new listing must climb.