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Transparency refers to the degree to which an object allows visible light to pass through. The transparency of a gemstone refers to the ability of the gemstone to transmit visible light, and its size depends on the chemical composition and internal structure of the gemstone. The transparency of gemstones is one of the important content to identify their pros and cons. Bu “suv boshi” that people often say in the jade circle refers to transparency.

The transparency of gems is divided into the following five levels:

①Transparent refers to an object that can fully transmit visible light like transparent glass, and can clearly reach the opposite side through gems. Such as diamonds and crystals with fine texture.

②Translucent refers to tourmaline that can transmit visible light, but the object on the opposite side of the gemstone is obscured, such as translucent tourmaline.

③Sub-transparent, refers to the visible light through the gemstone, but the opposite object cannot be seen. Such as jade, chalcedony, kemirmoq, va hokazo.

④ Semi-translucent, which means that there is very little light, and the opposite object cannot be seen through the gem. Such as agate.

⑤Opaque, refers to the gemstones that are ground into thin slices, they are completely opaque to visible light, and objects on the opposite side cannot be seen. Such as pyrite.

In the gem world, there is a tendency to divide the transparency of gems into three levels: shaffof, translucent and opaque, and to merge translucent and translucent into the first level of translucency.

Because there are some traces or impurities left in the gem during the crystallization process, such as inclusions, fine spherical structure, va hokazo., gems containing this special factor are produced and exhibited some peculiarities due to the principle of reflection under light irradiation. Visual effects, this phenomenon is the special optical effect of gems. Common special optical effects of gems are as follows:

①The cat’s eye effect means that some gemstones that are processed into a curved surface show a parallel-moving silk-like light band on the surface when illuminated by light. Because its shape resembles a cat’s eye, this phenomenon is called Cat’s eye effect. There are not many varieties of gemstones with cat’s eye effect in nature, and the most common and most typical one is golden emerald cat’s eye.

②Starlight effect refers to some gemstones processed into a curved surface, under the light, the surface of the gemstones shows intersecting four, six or twelve beams of star-shaped flashing lights, which resemble the stars in the night sky.

③Color changing effect, also known as halo effect, refers to a rare natural phenomenon that can show red, apelsin, sariq, yashil rang, blue, blue and purple on the same gemstone ring surface, which can change with the rotation of the gem. It is called the color changing effect. The color change effect is a unique optical effect of high-quality opal, which is rare in other gems.

④The discoloration effect means that different colors can appear on the same gemstone on the ring face under different light. This phenomenon is called the discoloration effect. The discoloration effect generally refers to the green variant of chrysoberyl, also called alexandrite. This chrysoberyl variant is green under sunlight and appears purple-red under incandescent light. The gemstones with this discoloration effect include alum-containing sapphires from Colombia and green sapphires from Thailand.

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