About This Item: 【SIMPLE AND FAST TO USE】: Our diamond detector quickly verifies the authenticity of diamonds, jade, agate, and crystal. A real diamond will trigger the indicator light to show 9 or higher and emit a sound. 【REASONABLE DESIGN】: This second-generation High Accuracy Professional Jeweler diamond tester is straightforward to use. Simply install the battery (not included) and turn the switch on before use. 【QUICK DISTINGUISH】: To use, open the diamond gem tester and position the tip perpendicular (90 degrees) to the gemstone. Get quick results within seconds to determine if the item is genuine or fake. 【SCOPE OF APPLICATION】: The Diamond Tester Pen can be used for diamonds, jade, crystal, and agate. This diamond checker tool provides easy and fast authenticity testing of various gemstones. Keywords: High accuracy diamond testerProfessional jeweler diamond detectorDiamond gem tester penQuick gemstone authenticity testerJade, agate, crystal testerEasy-to-use diamond checkerPortable diamond detectorSecond-generation gem testerReal vs. fake gemstone tester