How to identify synthetic diamonds and natural diamonds

Diamond (Diamond), mineral name is diamond, is recognized as the king of gems. Its greatest feature is the highest hardness and highly refractive, in light shine,

dazzling. But its surface with glass, crystal and artificial synthetic diamond similar to more difficult to identify.

Accurate identification only by instrumentation, and easy identification of the following methods may be used:
1. Hardness testing diamonds are the hardest known naturally occurring substance, nothing can draw on the diamond marks, if marked by traces is by no means polycrystalline diamond .
(2) Thermal resistance test to be identified in diamonds and other similar articles breath while, if the surface of the diamond should be higher than the other

condensed mist mist on the items faster evaporation, because diamond has high thermal conductivity causes .
3 Observe the reflected light can be observed with a magnifying glass diamond Waist presents a very fine matte-like and have a bright reflected light crystal products.

This feature of the diamond is unique.
4. Observed under a magnifying glass to see the growing point, genuine diamond crystal surface often ditch continued and growing point of the triangle, then see these

characteristics in terms of fakes. "
Imitation diamond imitations three categories:
① added alumina ordinary glass, because the refractive index and dispersion improved, easy mistake, but the hardness is low. ② synthetic zirconia imitation, high

hardness, refraction good, but will be reflected in the rotation more IPL, with the real thing in the rotation only reflected a weak yellow, blue and white

Phototherapy, compared with significant differences.
⑧ with colorless synthetic sapphire and spinel imitation, hardness close, but there is a low refractive index and birefringence, ghosting visible under a magnifying

glass.