✔ Professional Diamond Selector II will indicate genuine diamond or fake ✔ It is designed for quick, precise, and safe diamond testing. ✔ The diamond tester reading is quite easy to read with the scale. ✔ If stone is Fake crystal, a simulant such as cubic zirconium ( CZ ), will be no reaction ✔ Emits audible sounds to easily differentiate the readings,Not included the battery. Volume is adjustable by the volume pully.