Professional Diamond Tester Pen ($12.49)

Gamers rise up – this bad boy is only $12.49 (with coupon power-up). Updated: 29-01-2026.

Professional Diamond Tester Pen Portable Electronic Diamond Identifier Fast and Accurate Testing for Jewelry Jade Rub with LCD and LED Indicators – Black
Banggood warehouse: China.

Price: $12.49

Additional Banggood coupons:
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