This diamond tester kit by Presidium will verify the authenticity of your diamonds quickly and accurately.   Use the tester on diamonds as small as .02 carats, as well as polished and unpolished gemstones.  To use, simply place the probe tip on the stone to get an accurate reading.  The tester has an easy-to-read LED display, and a metal alert buzzer once the reading is complete.  There’s also no need to wait in between tests, which will speed up your process.  Order today at Stuller.com/tools.