Diamond indicator （ green light ）, which illuminates if the stone is a REAL diamond.
20 second warm-up time with a 120 second shut off alarm.
If stone is Fake crystal, a simulant such as cubic zirconium （ CZ ）, will be no reaction.
metal alert （ a long beep when user accidentally touches metal rather than stone ）
Large / small switch for testing diamonds + - 8 points
新手教學
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