High Accuracy Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection,Diamond Tester, Professional Jewelers' Gemstone Detector (Diamond Tester Pen)

High Accuracy Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection,Diamond Tester, Professional Jewelers' Gemstone Detector,Novice and Expert Jeweler Tool How To Test Diamond： 1. Remove the pen cap 2. Press the power switch and slide it to the "diamond" position. The red light POWER will light up and the tester will start preheating 3. Preheat for 25 seconds, the green light READY will light up, the tester is ready and you can start testing 4. The conductive metal plate on the side must be touched during the test 5. Keep the test pen vertical to the diamond 6.Real diamonds will light up a red LED and make a clear sound Fake diamonds will light up a green or yellow LED and will not make a clear sound 7. Slide the switch on the tester to the "ultraviolet" position . Real diamonds usually have blue fluorescence 8. Note: The probe can only touch the diamond gemstone, not metal or skin, to avoid false results How do I ensure I get the most accurate results every time? Follow 3 steps: 1. Touch the metal plate with bare fingers. 2. Hold the probe at a 90° angle to the stone. 3. Use in standard indoor temps (50°F–95°F). These tips ensure professional-level precision and prevent inconclusive readings. Can this tester distinguish between natural and lab-grown diamonds? No. Because lab-grown diamonds (CVD/HPHT) share identical physical and thermal properties with natural diamonds, no thermal tester can distinguish them. It will identify both as "Diamond." For high-end appraisal, laboratory equipment is required. Can it test rings or colored gems like rubies? It’s optimized for diamonds and simulants like CZ and glass. For mounted rings, touch only the stone, not the metal. It’s not designed for colored gems like rubies or pearls, but the UV light can help observe unique fluorescence patterns.