Features:100% brand newEasy to use even for a new beginnerEmit audible sounds to give accurate readingDiamond indicator will be showed if the stone is a REAL diamond (Green light)Metal alert (continuous buzzing sound when user accidentally touches metal rather than stone)Large / small switch for testing diamonds +/ - 8 pointsTo emit sounds to give accurate readingLCD display & LED indicatorIf stone is Fake crystal， a stimulant such as cubic zirconium (CZ)， will be no reactionDimension: 16.5 x 4.0 x 2.2cmPowered by DC 9V battery x 1 (Battery Not Included)Package:1 x Diamond Selector II Tester1 x English User Manual1 x Protected leather bag