MIZAR DIAMOND DETECTIVE DIAMOND TESTER This is a new Rs Mizar diamond tester This state of the art tester is simple but precise, giving the user a quick "yes/no" reading Housed in a high impact plastic case, it is everything one needs to test diamonds in rapid succession, whether mounted or unmounted Has a metal alert ( a long beep if metal is touch rather than stone) Large/small switch for testing diamonds over and under eight points