Notícias de jóias

wholesale gemstone pendants Distinguish between glass and crystal under polarizing lens

Postado em por Kingjy

If the crystal you are testing is bead-shaped, when you turn the crystal, in addition to seeing the phenomenon of light and dark changes, you will have amazing discoveries. At a particular angle, you will see a colored interference pattern as shown in the figure below. The pattern is a hollow black cross with colored stripes. Because the red part of the center circle resembles a bull’s eye, we call it a bull’s eye interference pattern.

The reason for the formation of interference patterns is very complicated, but the phenomenon is easy to observe. This kind of bull’s eye interferogram is unique to crystals. In other words, once you see such an interferogram, the gemstone being measured can definitely be crystal. No entanto, it is important to note that synthetic Mercury also has a bull’s-eye interferogram. Portanto, the bull’s-eye interferogram can only prove that the measured gem is not glass, but it cannot prove the naturalness of crystal.

Most of the common crystal bracelets on the market are in the shape of a bead, and the interference pattern can be easily observed with the help of a polarizer. Then the interference pattern can not be seen in other shapes of crystal? Of course not, the interferogram should be found in all cambered crystals, but it is very difficult to see the interferogram if it is a faceted crystal. Primeiro, a magnifying glass needs to be added between the gem and the upper polarizer to help converge the light. Segundo, the gem must be in a specific position. Under the polarizer, although the bull’s eye interferogram can only be observed at a specific angle, as long as it is seen, it can be determined to be a crystal. Portanto, the polarizer is of great significance for the identification of crystals.

At present, the price of portable polarizers on the market is about two to three hundred yuan. If you have a lot of crystals, or you are a super fan of crystals, polarizers are still worth investing in. You can also DIY a simple polarizer with two polarized lenses. It is not that polarized sunglasses can directly replace polarized lenses. When we use polarized light, the path of light should first pass through a polarizer, then through the gem, then through the second polarizer, and finally enter our eyes. It is impossible to let the light travel along the above path when observing the gem with direct light sunglasses. de.

It is precisely because of the travel route of light that when using a polarizer, you also need to pay extra attention, aquilo é, the measured gem must be transparent (at least translucent). Only when the gemstone transmits light can the light finally reach our eyes. If the gem itself is opaque, no matter how you turn the gem, it will undoubtedly look completely black. Portanto, for opaque gems, polarizers are useless. No entanto, crystal does not seem to have to worry about its transparency. Regardless of any type of crystal and all gems that are as transparent as crystal, polarizers are a very useful identification tool.

Finalmente, let us summarize how the polarizer distinguishes glass and crystal in one second.

1. Turn on the power and turn the upper polarizer until the field of view is completely black.

2. Place the gem on the lower polarizer and rotate the gem to observe the change in light and shade.

3. If the gem is rotated for four times, or if you see a bull’s eye interference pattern, it must be crystal; if the gem is always dark, it is glass.

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