Features:1. This diamond tester has a highly compact design and will help you to tell the difference between a genuine diamond and fake diamond.2. This tester comes with a PU case and small testing platform for holding loose stones.3. LED light and audio result indication.4. Simple calibration for stones of various sizes.5. Easy to use even for a new beginner.6. Green indicator will be showed if the stone is a real diamond. It will make continuous buzzing sound when user accidentally touches metal rather than stone.Specification:Material: PlasticColor: Shown As PicturesSize: Approx. 16 * 4 * 2.1cm / 6.3 * 1.57 * 0.83inchBattery: 9V Battery (Not Included)Weight: 160gType: Jewelry ToolPackage List:1 * Diamond Tester1 * Manual1 * Testing Platform