--- title: "presidium gem tester — Niche Verdict: Worth a look (54/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/arts-crafts-sewing/presidium-gem-tester" last_updated: "2026-07-10T04:31:57.544Z" locale: en meta: description: "presidium gem tester shows beatable incumbent ratings (4.0★), but a small market ($366K/yr) keeps it on the watch list." "og:description": "presidium gem tester shows beatable incumbent ratings (4.0★), but a small market ($366K/yr) keeps it on the watch list." "og:title": "presidium gem tester — Niche Verdict: Worth a look (54/100) | Amazon United States - Flapen" --- Back to Flapen home # **presidium gem tester** **Worth a look****54/100 ** presidium gem tester shows beatable incumbent ratings (4.0★), but a small market ($366K/yr) keeps it on the watch list. **Market/yr** **$366K** **Growth (1y)** **+304.3%** **Products** **16** **Brands** **11** was 14 a year ago **Sellers** **21** **Price range** **$10.95–$409.89** **Returns** **5.7%** **Rating** **4.0★** **Worth a look** Scored 54/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **18** ×0.30 Growth **86** ×0.30 Competition **43** ×0.20 Quality gap **87** ×0.10 Returns **53** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +304.3% year over year. 7K3KPrime Day '25Black Friday '25Spike '26Jul '24Nov '24Mar '25Jun '25Oct '25Feb '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 1.3× ## **Competition** - Presidium43% - HMKIS11% - TEKCOPLUS9% - Siziviki8% - GTE6% - Valkynos4% - Other (5 brands)18% The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them. 11 brands and 21 sellers compete here. **Brands** **11 **▼falling was 14 a year ago **Sellers** **21** **Top 5 brand share** **78%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones](https://m.media-amazon.com/images/I/411u5Jc07iL.jpg) [**Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones**](https://www.amazon.com/dp/B000TD3G8Q) Presidium$283.114.2★1,33531%▼falling 2 ![HMKIS Diamond Tester Pen Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier Diamond Selector for Novice and Expert (Non-Rechargeable)](https://m.media-amazon.com/images/I/41YOr1285DL.jpg) [**HMKIS Diamond Tester Pen Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier Diamond Selector for Novice and Expert (Non-Rechargeable)**](https://www.amazon.com/dp/B08MTG5NHJ) HMKIS$16.984.1★8,31311%▲rising 3 ![Diamond Tester Professional Jewelers Gemstone Detector High Accuracy Diamond Checker Pen Professional for Jewelers Gem Tester (Jewelry-Only Detection)](https://m.media-amazon.com/images/I/41Z3o3G6kQL.jpg) [**Diamond Tester Professional Jewelers Gemstone Detector High Accuracy Diamond Checker Pen Professional for Jewelers Gem Tester (Jewelry-Only Detection)**](https://www.amazon.com/dp/B0B5DHYMWX) Siziviki$10.954.1★9488%▲rising 4 ![Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE](https://m.media-amazon.com/images/I/51pTzeoh0rL.jpg) [**Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE**](https://www.amazon.com/dp/B0BY3N4KBD) GTE$38.174.3★7046%▲rising 5 ![Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds Moissanites and Diamond Simulants](https://m.media-amazon.com/images/I/41Bkz6KS3HL.jpg) [**Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds Moissanites and Diamond Simulants**](https://www.amazon.com/dp/B004QYR8U6) Presidium$225.393.7★4035%—flat 6 ![Heavy Duty Calcite Dichroscope Gemstone Tester Trichoic Pleochroic Colors Gemstone Identification Gemstones Gemological Testing Diamond Jeweler Tool Metal Body Gemology](https://m.media-amazon.com/images/I/41p+88zZOqL.jpg) [**Heavy Duty Calcite Dichroscope Gemstone Tester Trichoic Pleochroic Colors Gemstone Identification Gemstones Gemological Testing Diamond Jeweler Tool Metal Body Gemology**](https://www.amazon.com/dp/B01HGFL5YQ) TEKCOPLUS$32.334.3★3035%▲rising 7 ![Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included](https://m.media-amazon.com/images/I/41AgO8KzPjL.jpg) [**Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included**](https://www.amazon.com/dp/B0F9PM2YGV) Valkynos$33.414.3★1984%—flat 8 ![Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds Rubies Sapphires Aquamarine Glass Filter Reliable Portable Ideal for Gemologists and Jewelers](https://m.media-amazon.com/images/I/21dE6P54KKL.jpg) [**Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds Rubies Sapphires Aquamarine Glass Filter Reliable Portable Ideal for Gemologists and Jewelers**](https://www.amazon.com/dp/B0D896DPHQ) TEKCOPLUS$21.704.0★1044%▲rising 9 ![Gemtone All-in-One Gold Silver Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions Digital Scale Diamond Tester Touchstone and Accessories](https://m.media-amazon.com/images/I/51HYohERsUL.jpg) [**Gemtone All-in-One Gold Silver Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions Digital Scale Diamond Tester Touchstone and Accessories**](https://www.amazon.com/dp/B0FP3YLWKX) Gemtone$55.764.4★1754%▲rising 10 ![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)](https://m.media-amazon.com/images/I/51zV2YIJ0QL.jpg) [**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)**](https://www.amazon.com/dp/B06Y2MT175) Hqdz$15.274.1★7,5164%▲rising 11 ![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)](https://m.media-amazon.com/images/I/514rAiaaiKL.jpg) [**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)**](https://www.amazon.com/dp/B0F94G5X5G) Hqdz-td$19.744.0★1724%▼falling 12 ![SmartPro SPGE-I Gem Eye I Gem and Diamond Tester Smart Pro](https://m.media-amazon.com/images/I/41+491VLBLL.jpg) [**SmartPro SPGE-I Gem Eye I Gem and Diamond Tester Smart Pro**](https://www.amazon.com/dp/B01MTELX43) SmartPro$232.523.5★1543%▼falling 13 ![Presidium Instruments Gem Tester II (PGT II) Now with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones](https://m.media-amazon.com/images/I/41GS7VH2iGL.jpg) [**Presidium Instruments Gem Tester II (PGT II) Now with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones**](https://www.amazon.com/dp/B08M87J44P) Presidium$290.254.1★4223%▼falling 14 ![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones](https://m.media-amazon.com/images/I/41QYtPV65vL.jpg) [**Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones**](https://www.amazon.com/dp/B06X979666) Presidium$313.473.6★612%▼falling 15 ![Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool](https://m.media-amazon.com/images/I/312-gZ9fa0L.jpg) [**Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool**](https://www.amazon.com/dp/B000TD30NM) Presidium$409.893.1★382%—flat **~~Showing 15 of 16 — show all ~~** ## **Product shelf** All 16 tracked products in this niche. Top sellersNewestTrending [![Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones](https://m.media-amazon.com/images/I/411u5Jc07iL.jpg)**Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones** Presidium**$283.11**4.2★1,335 reviews](https://www.amazon.com/dp/B000TD3G8Q) [![HMKIS Diamond Tester Pen Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier Diamond Selector for Novice and Expert (Non-Rechargeable)](https://m.media-amazon.com/images/I/41YOr1285DL.jpg)**HMKIS Diamond Tester Pen Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier Diamond Selector for Novice and Expert (Non-Rechargeable)** HMKIS**$16.98**4.1★8,313 reviews](https://www.amazon.com/dp/B08MTG5NHJ) [![Diamond Tester Professional Jewelers Gemstone Detector High Accuracy Diamond Checker Pen Professional for Jewelers Gem Tester (Jewelry-Only Detection)](https://m.media-amazon.com/images/I/41Z3o3G6kQL.jpg)**Diamond Tester Professional Jewelers Gemstone Detector High Accuracy Diamond Checker Pen Professional for Jewelers Gem Tester (Jewelry-Only Detection)** Siziviki**$10.95**4.1★948 reviews](https://www.amazon.com/dp/B0B5DHYMWX) [![Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE](https://m.media-amazon.com/images/I/51pTzeoh0rL.jpg)**Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE** GTE**$38.17**4.3★704 reviews](https://www.amazon.com/dp/B0BY3N4KBD) [![Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds Moissanites and Diamond Simulants](https://m.media-amazon.com/images/I/41Bkz6KS3HL.jpg)**Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds Moissanites and Diamond Simulants** Presidium**$225.39**3.7★403 reviews](https://www.amazon.com/dp/B004QYR8U6) [![Heavy Duty Calcite Dichroscope Gemstone Tester Trichoic Pleochroic Colors Gemstone Identification Gemstones Gemological Testing Diamond Jeweler Tool Metal Body Gemology](https://m.media-amazon.com/images/I/41p+88zZOqL.jpg)**Heavy Duty Calcite Dichroscope Gemstone Tester Trichoic Pleochroic Colors Gemstone Identification Gemstones Gemological Testing Diamond Jeweler Tool Metal Body Gemology** TEKCOPLUS**$32.33**4.3★303 reviews](https://www.amazon.com/dp/B01HGFL5YQ) [![Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included](https://m.media-amazon.com/images/I/41AgO8KzPjL.jpg)**Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor Fast 0.5s Detection Portable Gem Checker for Novice & Experts Battery Included** Valkynos**$33.41**4.3★198 reviews](https://www.amazon.com/dp/B0F9PM2YGV) [![Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds Rubies Sapphires Aquamarine Glass Filter Reliable Portable Ideal for Gemologists and Jewelers](https://m.media-amazon.com/images/I/21dE6P54KKL.jpg)**Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds Rubies Sapphires Aquamarine Glass Filter Reliable Portable Ideal for Gemologists and Jewelers** TEKCOPLUS**$21.70**4.0★104 reviews](https://www.amazon.com/dp/B0D896DPHQ) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Ease Of Use**23% *“Very handy to have”* **Quality-Overall**16% *“If you're looking for something reliable, well-made, and at a fair price point, this is the perfect choice”* **Value For Money**16% *“Good for the money”* **Advertised Vs Actual Product**10% *“Just what I needed”* **Efficiency**7% *“The diamond tester works fine”* **Weight Light**3% *“I love how lightweight it is”* **Instructions/User Manual/Troubleshooting**3% *“The included instructions were helpful”* **Portability**2% *“can be carried around conveniently”* **Measurement/Reading Accuracy**2% *“It does give accurate reading”* **Battery Life**2% *“Battery life is okay”* ### **What buyers complain about ** **Functionality-Overall**21% *“Not even functional”* **Quality-Overall**20% *“Cheap quality”* **Durability**9% *“Broke”* **Instructions/User Manual/Troubleshooting**6% *“No instructions on use and cheaply made”* **Value For Money**5% *“Its pricey for the average person”* **Measurement/Reading Accuracy**5% *“Does't give accurate reading like it stated”* **Defective Material/Parts**3% *“Did I receive a defective product”* **Battery Life**3% *“The non-rechargeable battery dies quickly”* **Advertised Vs Actual Product**3% *“Inadequate description”* **Heating**2% *“Hot garbage”* #### **Top return reasons**- Functionality-Overall44% - Advertised Vs Actual Product9% - Measurement/Reading Accuracy8% - Defective Material/Parts7% - Value For Money5% - Quality-Overall4% - Instructions/User Manual/Troubleshooting4% - Certifications3% - Charging2% - Ease Of Use2%