How to identify the diamond true or false

How to differentiate true and false 1, pencil assay method to diamonds after wetting with water, using pencil on it, really doesn't leave a pencil across the surface of the diamond. Crystal, glass, tourmaline, colorless transparent fake diamond will leave traces. 2, pen assay method after a pen dipped in ink on the diamond to draw lines, true diamond under a magnifying glass to observe, the surface will leave a smooth and continuous ink lines, and no broken mark. Fake diamond lines are composed of small dots. 3, score check on the hardness of diamond are strong, with blades and hard to leave Nick on it. In addition, gently with diamond on the glass, will leave a more apparent white mark. Fake diamond is no such phenomenon. 4, small water survey method will be the top of the diamond flat mop wipe up, use a toothpick to touch a drop of water on it, at the end of water droplets on the true diamond will moderate the small circle of water droplets shape. Water droplets on the fake diamond will soon spread out. 5, light with single index, check true diamond, radiant, bright brightness characteristics, the invisible hand grain on hand. Such as crystal as fake diamond, and its poor dispersion and low refractive index, through the crystal, such as the visible hand. More diamond consulting visit/jewelry net