CE Compass Diamond Selector V2 Portable Diamond Tester & Gemstone Platform Jeweler tool LED light and audio result indication Accurate and reliable reading Metal alert Simple calibration for stones of various sizes Testing platform for loose stones Color: Black Initial warm-up: ~ 20 sec Indicator: Audio and LED lamps Power: 1 x 9V battery (not included) Testing Capability: Diamonds/ Diamond simulation (e.g. CZ)/ Metal