The jewellery market has valuable crystal treasures and fine products, as well as imitation crystal products with fish eyes.
Crystal is a glass product. It is very easy to identify true and false if there is instrument detection. However, it is impossible for consumers to bring crystal instruments with their instruments. Therefore, it is very important to master some simple identification methods.
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Is it a crystal ball or a glass ball?
The crystal ball has a high ornamental value, so the price is also very high. A good crystal ball of 10 cm or more, worth 10,000 to several hundred thousand yuan. Driven by economic interests, unscrupulous businessmen take the glass ball as a crystal ball in order to obtain huge profits.
Whether it is a crystal ball or a glass ball is very simple and reliable. Just put a piece of hair on a piece of white paper, press the ball on the hair, continuously rotate the ball and observe the change of the hair through the sphere. It is found that the double shadow of the hair is a crystal ball, if it is rotated in any direction. Can not see the hair double shadow is a glass ball. This is because crystal has a birefringence and glass is an amorphous body that is only refracted.
Is it a crystal necklace or a glass chain?
Glass necklaces are often encountered in the jewelry market. There are two types of glass necklaces, one is glass molding, and the other is glass. Whether the naked eye is a crystal necklace or a glass necklace, often take a try and look at it.
One try is to put the necklace on the face to test the cool feeling. The glass is slow in heat conduction, and it will feel warm after a while, and the crystal has a cool feeling because of its fast heat conduction.
Second, the first thing to look at is whether there are bubbles inside the jewelry. Glass products generally have spherical or elongated bubbles. Similar to the bubble being present in the viscous liquid being stirred, then see if there is a flow line, and the flow line is glass. The so-called flow line is a phenomenon formed by the glass melt during the cooling process or other factors, like the mercerizing effect on the viscous flow syrup. Molded glass products, the surface is often not flat, not smooth and there are traces of the impression. If there is a perforation, the hole is smooth, and there are often depressions at both ends of the hole.
If you use the instrument to observe and analyze from the optical point of view, the natural crystal necklace is a kind of right-angled light, placed vertically in the sun, can give off colorful brilliance, no matter which angle, it can emit beautiful brilliance, fake can not.
From the perspective of physicochemical analysis, the natural crystal necklace has a large difference in hardness, specific gravity, refractive index and fake crystal necklace. The natural crystal necklace has a hardness of 7.00 and a refractive index of 1.54. The false hardness is only 5.20-6.10. The refractive index is less than 1.00.
If you look at the purity, the purity of the fake is high, and the natural crystals have different degrees of color and color.
The natural crystal necklace seems to be coated with a thin layer of oil and a cyan color. Nothing is fake, it is white like glass.
Is it crystal glasses or glasses?
Put one piece of crystal glasses and glasses, wipe it clean (must clean it), then use a matchstick or a toothpick to dip the water, and drop a few drops on each lens. The diameter of the water drops is about 1 mm, in the same environment. Observed at temperature, if it is a glass spectacle lens, the water droplets will spread out. If it is a crystal, the water droplets will remain spherical. The natural evaporation of water droplets on crystal glasses is nearly twice as fast as that of glass lenses. This quickly separates the glass from the crystal lens. The reason is that the glass is an amorphous body, the crystal is a crystalline body, and the surface tension and the thermal conductivity are different.
Is it a crystal rough or a crystal block?
In the crystal rough market, glass blocks are often used as fake crystals for sale. There are three cases, one is to cut and polish the glass block into a hexagonal prism to sell as a crystal single crystal; one kind of the glass block, the surface is artificially treated, the pit is concave, and there is iron oxide and soil pollution. The treated surface often opens a window through which the interior is pure and flawless. In the case of the above situation, we must take one, two, and three. The so-called 掂 is to take a heavy feeling on the hand, because the crystal is larger than the glass (except lead glass), the heavy feeling is crystal, and the light feeling is glass. The so-called stroke is to use crystal to engrave the crystal block, which can be used as the glass, because the glass hardness is smaller than the crystal hardness. The so-called look is to see if there are bubbles or streamline structure, and some are glass. It can generally be distinguished by the above method.
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