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The gems to be tested must be clean, dry, and at room temperature. This diamond tester has a highly compact design, which can perform fast, accurate, and safe diamond testing, which is very suitable for carrying with you when buying diamonds.-Color:Black

-Dimension:Approx. 160x40x22mm / 6.3×1.6×0.9inch

-Material:Plastic + Metal
-Type:Diamond Tester