Bentop Diamond Tester II V2 Selector Gemstone Jewelry Gems Tool with Case Professional diamond selector II will indicate genuine diamond or fake. Diamond indicator (GREEN light ), which illuminates if the stone is a REAL diamond Uses large / small switches for testing diamonds LCD display, LED lights, Emits audible sounds to easily differentiate the readings Simple calibration for stones of various sizes. Metal alert ( a long beep when user accidentally touches metal rather than stone) Accurate and reliable reading. Testing platform for loose stones