N.D.G.L is an Independant Laboratory grading diamonds based on induvidual characteristics gained from utilizing a variety of gemstone testing insrtuments: 10x magnification corrected loupe and a binocular microscope, millimeter guage, non-contact measuring device, spectroscope systems, electronic balance, master colour comparison diamonds, ultraviolet light source, fibre optic illumination, and other instruments.
For further information or for your grading requirements contact: service@netdiamonds.co.za
