Introduction: Moissanite (a kind of silicon carbide) also known as carborundum, most of the Moissanite are synthetic, it is only one-tenth of the price of diamonds. However, Moissanite is the world's second hardness gem (Moxes 9.25), and because of its good thermal conductivity, most diamond tester can not identify it. Now, with this Moissanite tester, you can easily detect between diamond and moissanite. Note: The tester can only detect between moissanite and diamond. Bullet: Pocket-size, portable and handlingTest without damage, convenient and accurate operationWork power: DC 9V batteryLow eletricity consumption, warning and indicating functions if the battery just has low electricity.(Indicate with red light.) Ten minutes late since the last test, the power indicator light (green) turns off automatically and sends out "DuDu" sound for a long time to warn the user to turn off the tester