Posted by
dizaa jewelry lovers on Tuesday, April 07, 2009 2:11:51 AM
In recent years, the use of an artificial notch direction Stars imitate precious stones are often used means of false stones on convex, but this method is very easy for false identification.
First of all, this gem with the lack of positive direction of the inclusions;
Secondly, precious stones at Scratch the surface of common direction.
In addition, the Stars of Star Line shape stones exist incomplete, irregular or right direction, as well as bending, asymmetrical situation, and some mineral crystal system with the stars do not match the number of lines.
Of these precious stones at the time to take pictures. Found another star to the identification of these man-made phenomenon of the method has helped: Shooting Stars of man-made gems, the camera to the focal length of convex-shaped jewel at the bottom of the surface at this time, the most clear situation Stars. Shooting Stars in natural stones, the cameras are at the focal length of the convex-shaped jewel at the top of the surface.
This means focusing when using a microscope can also be observed, especially for deep color, or opaque and not easily observed that the inclusion of precious stones
From :
wholesale jewelry