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💎 Test like a pro, inspect like a boss — never miss a real diamond again!
The HMKIS Diamond Tester Pen combines advanced thermal conductivity technology with dual power options (Type-C & 9V battery) to deliver fast, precise diamond authenticity testing. Paired with a powerful 60X LED jeweler’s loupe, it offers millennial professionals a sleek, portable solution for confident gem verification and detailed inspection—no specialized training required. Adjustable size settings and clear visual/audio feedback ensure reliable results across micro to large diamonds, making it an essential tool for jewelry managers, collectors, and enthusiasts aiming to stay ahead in the luxury market.









| ASIN | B08MTG5NHJ |
| Best Sellers Rank | #2,100 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #2 in Jewelry Diamond Testers |
| Brand | HMKIS |
| Brand Name | HMKIS |
| Color | Black |
| Customer Reviews | 4.0 out of 5 stars 8,543 Reviews |
| Global Trade Identification Number | 09070190994879 |
| Included Components | 60X Microscope |
| Item Dimensions | 10.16 x 2.17 x 1.38 inches |
| Item Highlight | Based on High Thermal Conductivity of Diamonds. Powered by USB or 9V Battery Diamond Selector for Novice and Expert |
| Item Weight | 120 g |
| Item dimensions L x W x H | 10.16 x 2.17 x 1.38 inches |
| Lower Temperature Rating | 5 °C |
| Manufacturer | HMKIS |
| Maximum Operating Voltage | 9 volts |
| Measurement Type | Thermal Conductivity Scale (1-9) |
| Minimum Operating Voltage | 5 volts |
| Model | HXK+FDJ |
| Number of Items | 5 |
| Number of Packs | 1 |
| Part Number | HMKIS |
| Power Source | Battery Powered |
| Specification Met | CE, RoHS |
| Style | Appraising jewelry, gemstones, unique rocks, calligraphy, paintings, antiques, and other collectibles, as well as offering expert evaluations for gems, fine jewelry, diamonds, coins, stamps, and watches. Style Appraising jewelry, gemstones, unique rocks, calligraphy, paintings, antiques, and other collectibles, as well as offering expert evaluations for gems, fine jewelry, diamonds, coins, stamps, and watches. See more |
| Style Name | Appraising jewelry, gemstones, unique rocks, calligraphy, paintings, antiques, and other collectibles, as well as offering expert evaluations for gems, fine jewelry, diamonds, coins, stamps, and watches. |
| Unit Count | 1 Count |
| Upper Temperature Rating | 30 °C |
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