1 9V batteries required. (included)
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HMKIS Diamond Tester Pen, High Accuracy Jewelry Diamond Tester＋ 60X Mini LED Magnifying, Professional Diamond Selector…$18.99
[Easy to Use]: Real Diamond will Emits sounds and lights >=9.
[Intuitive Design]: Fake crystal, such as cubic zirconium ( CZ ), crystal, glass will be no sounds and lights
[fast and safe ]: This diamond selector tester designed for quick, precise, and safe diamond testing. No harm to diamonds.