Gemstones are eye-catching and have long been loved by people. However, the price of natural gemstones is relatively expensive due to various reasons such as difficulty in mining and complicated processing procedures. Therefore, once deceived and bought fakes, the economic losses are also very heavy.
Jade: Known as the "birthstone of May", the emerald color is bright, with different colors such as green, red, yellow, white, purple, gray and black. Among them, the most precious and pure emerald green has economic value and collection value. . Therefore, the most common and deceptive in the jade market is fake green. The fake green jade, which is more common in the market, is mainly treated by chemical treatment, and the interior is filled with colored resin. Most of them come from Guangdong and Fujian, and there are many on the market. Other dyeing, electroplating, bottoming, fire, green film, etc. There is also a kind of "fake material", which is mostly made up of glass, burning materials, miscellaneous stones or some green jade, such as green chalcedony and green agate.
The fake jade is mainly characterized by the green excess and the sinister nature, and the texture has the reticular marks destroyed by the high temperature chemical treatment. It can be checked by means of a color filter and a magnifying glass. The colored jade will turn red under the color filter, the color is sluggish, the evil is not correct, and there is a feeling of burning yellow; under the magnifying glass, the color always exists at the crack. The fake materials are easier to identify because they are shoddy.
Sapphire: Sapphire is one of the four treasures of precious gems. Its preciousness is second only to diamonds and rubies. Because of its high value and color, it has more substitutes and counterfeits, mainly blue tips. Spar, blue topaz, blue glass, artificial sapphire, etc. Among them, blue spinel is the most similar to sapphire, so be careful to distinguish between the purchases.
The difference is mainly from the aspects of color, hardness, refractive index, absorption spectrum and so on. In color, blue spinel yellow is gray, while sapphire blue is very pure; sapphire has a hardness of 9 grades, the surface is rarely scratched, and it is not easy to sand, and the blue spinel hardness is 8 Surface scratches are more than sapphire; sapphire is heterogeneous, with two refractive indices, while blue spinel has only one refractive index; if viewed with a Chelsea filter, sapphire will be grayish green, while blue The color spinel appears dark red.
Emerald: Because of its precious and rare, emeralds and diamonds, rubies and sapphires are called the world's four precious gems. There are many counterfeit items, almost all the green varieties of gems, not even the gems of green stones, are used to impersonate. The most common counterfeits are green zircon, green olivine, green garnet, green glass and synthetic emerald.
The main methods for distinguishing between true and false emeralds are as follows: 1. Using Chelsea filter to observe, the red is emerald, the green is other natural gemstones; 2. The emerald has lower refractive index, no refraction, and like green Gemstones such as diamonds have dazzling diamond brilliance. 3. The emerald has a lighter weight than many gems. 4. Inside the magnifying glass, natural emeralds generally have inclusions of solid, liquid, and gas mixed together. Artificially mostly gas or gas-liquid mixed inclusions, often in the form of clouds or plumes. The proportion and refractive index of artificial emeralds are generally low. Testing the specific gravity and refractive index of the two can be used as an aid to identification.
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