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High Accuracy Professional Jeweler Diamond Tester For Novice and Expert Product selling point 1.Professional Diamond Selector II will indicate genuine diamond or fake. 2.Uses large / small switches for testing diamonds 3.Emits audible sounds to easily differentiate the readings 4.Designed for quick, precise, and safe diamond testing. 5.If stone is Fake crystal, a simulant such as cubic zirconium ( CZ ), will be no reaction. Specification: Weight: 103 grams Powered by DC 9V battery x 1 (not included) Material: metal, plastic Colour: Black Size: 135 x 40 x 20mm / 5.31 x 1.57 * 0.79inch Package Contents: 1 x diamond tester 1 protective bag