This GIA tester will help you distinguish natural diamonds from synthetics and simulants in 2 seconds.  The tester combines advanced spectro-scopic technology to identify colorless to near-colorless diamonds.  You can test both mounted and loose diamonds .9 millimeters or greater in diameter.  This device fits on a bench or case, and has easy reading results with audio.  To use, simply press the probe on the stone where you’ll get the “pass” or “refer for further testing” reading.  Order today at Stuller.com/tools.