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This tester is designed to distinguish diamond, moissanite from other fake stones quickly. It has a fine elastic tipped probe for testing and able to identify stones as small as 2pt.

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This is a portable electronic device for distinguishing real diamonds from other simulated stones. It is designed for quick, precise, and safe diamond

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Brand Professional High Accuracy Diamond Tester 2 / 3 Gemstone Gem Selector Jewelry Watcher Tool LED Diamond Indicator Test Pen