LOHOME TM High Accuracy Professional Jeweler Diamond Tester Illuminated Loupe Jeweler Jewelry Tool Kit for Novice and Expert 100% brand new and high quality, very easy to use even for a newer. Professional Diamond Selector II will indicate genuine diamond or fake. Emits audible sounds to easily differentiate the readings. Uses large / small switches for testing diamonds. Batteries: 1 x 9v Battery (not included).