The starlight effect of colored gemstones, also known as the star color effect or the star shape effect. On the surface of some curved gemstones, there will be optical phenomena of intersections, six shots and up to twelve star-shaped rays, which are shaped like twin stars in the night sky.
The starlight effect is a special optical effect in gemstones because of the directional reflection of light in the gemstone crystals containing interlaced bodies in different directions. Therefore, the starlight effect does not need to pursue transparency blindly, but only the effect reflected by the starlight. Evaluate a gemstone with a star effect. Under the same quality, the more stars, the higher the value!
How does a gem produce a starlight effect?
1. There must be more than one set of densely packed inclusions or structures inside the gemstone. This is the premise;
2. The gemstone is cut into a curved surface and the bottom surface is parallel to the plane of the inclusion or structure. It is also the effect of the inclusions or structures arranged in parallel inside the gemstone on the refraction and reflection of light. A plurality of sets of parallel-arranged inclusions or structures form a plurality of bright bands and intersect at the surface of the gemstone to produce a starlight effect.
How to judge the starlight effect of a gem?
1. When examining the starlight effect, you need a pen to observe the gemstone, illuminate the surface of the gem with a pen light 5 cm away, and move the pen light back and forth to see if the starlight phenomenon will move with the light. Sharp and concentrated star lines are better starlights, and each star line should be uniform and symmetrical in length. In addition, the star line should be complete and there should be no missing star lines.
2. Starlight gemstones have the appearance of a curved surface. The shape of the convex surface should be symmetrical and pleasing. The starlight phenomenon should be located directly above the convex surface, and the starlight should extend to the whole gemstone. The height of the convex surface of the convex surface should be sufficient to highlight the obvious starlight phenomenon. If the convex surface is too flat, the starlight will be very weak, and there will be no sharp star clusters in the center, and it should be checked whether there is any under the waist. More weight, in general, the lower lumbar bulge should not exceed 20% of the full depth of the gemstone, and the waist should not have a gap.
Fdy Yarn,Polyester Fdy,Polyester Fdy Yarn,Polyester Dope Dyed Yarn
XINFENGMING GROUP , https://www.xfmgroupexport.com