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china anchor bracelet manufacturers Not difficult to identify glass

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Glass has been discovered and made into jewelry since more than 3000 BC. Due to the limitation of the production level, the glass output is small and the quality is not high, so it is used by the nobles. In modern times, glass is only used as a low-end decoration. It has many colors, including colorless, rooi, blou, blue-green, geel, pers, black, ens., and it is only inlaid on jewelry made of gold-plated or imitation gold (fake gold) materiaal. It is sold at a low price. Handicrafts are even sold at street stalls.

Because the appearance of glass sometimes resembles high-priced precious gems, it is also sold as high-end gems fraudulently, so it is important to identify them quickly and without damage. This identification is actually not too difficult, and the following methods can be used.

Touch method: Any glass is a non-crystalline amorphous body, which conducts heat relatively slowly, while gems are all crystals and conduct heat relatively quickly. Dus, when the sample is touched by hand, the glass has a “warm feeling” because of the slow heat transfer, while the crystalline gemstone makes people feel cold because of the fast heat transfer. For small samples, it is not convenient to touch by hand. You can lick the test sample with the tip of your tongue to determine the coolness or temperature.

Before testing, in order to be correct, you must first gain experience. You can prepare a small piece of crystal such as crystal and a piece of glass, first touch them with your hands or lick them, and then test the unknown sample after you are familiar with the difference between the two. grasp.

During the measurement, the unknown sample must be placed on the table for a period of time to avoid errors due to body temperature when removed from the body.

Considering the quality: because the price of glassy gemstones is very low, sometimes the price is not worth the cost of grinding, so it is not worth fine grinding, and the quality of grinding is very rough. The edges between planes are often not straight and sharp, but smooth. Most vitreous gemstones are cast by pouring molten glass into a mold. The quality of the cast products is worse, most of which are uneven, and there are often pits caused by condensation and shrinkage.

Magnifying glass observes the surface and interior of glass products, there are often curved or swirling fine lines, which look like the phenomenon caused by uneven mixing when honey or thick glue is poured into clean water and stirred. There are often more or less spherical, ellipsoidal, elongated small bubbles inside the glass. The above-mentioned lines and bubbles vary in size. The large ones can be seen by the naked eye, while the small ones must be illuminated by light and can be seen with a 10x magnifying glass.

 

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