1、FAST AND SAFE: The professional diamond selector will indicate real or fake diamond. Designed for fast, accurate and safe diamond testing 2、INTUITIVE DESIGN: Possess LCD display and LED indicators. Test diamond with a size switch, make a sound, and easily distinguish readings 3、EASY TO USE: The diamond test pen is easy to operate to get results, no professional required. Just turn on the detector, place the tip of the diamond tester on the gemstone (press lightly), the tester will not beep if the gemstone is fake, crystal or cubic zirconia 4、EASY IDENTIFICATION: A real diamond will sound and light equal to or more than 9. Imitation crystal, such as cubic zirconium (CZ), crystal, glass will be silent less than 9 5、30X Magnification: 30X LED magnification with battery(miniature microscope) is great for gemstone, coins, antiques, stamps, reading, checking and more