Tourmaline true and false identification method of six Shanghai Bao Arts Auctions

Many people are fond of placing accents to decorate houses, town house from evil spirits, indeed, as the finest tourmaline gem, not only to reflect the cultural atmosphere of the house, but also the feelings of harmony, improve the feng shui. But now the market price is very low number of counterfeit "tourmaline" confuse people's attention, so that people know what to do. So how to identify genuine tourmaline it? Xiao Bian article came to tell you about identification of tourmaline, so that we polish eye, not deception. Tourmaline, also known as tourmaline, the composition of complex silicates, its Mohs hardness of 7-7.5 between 2.9-3.2, the proportion of the change in refractive index between 1.624-1.644. Under normal circumstances, tourmaline raw columnar elongated, cylindrical vertical lines, cross-section was cambered crystal triangles, raw materials are easy to identify. Here are some simple methods to identify genuine tourmaline: tourmaline Identification A: The main attention when purchasing to identify tourmaline following aspects: 1) Tourmaline colors: red and blue tourmaline is more expensive, the more common yellow and green . In selecting tourmaline jewelry inlaid in red, blue, green for good, bright color uniformity requirements; places rich color tourmaline tourmaline necklace and bracelet better, each and beads of color may be different, with a red, yellow, blue, green, purple and other colors; 2) transparency of tourmaline: tourmaline crystal clear requirements, the more transparent the better the quality, do not have clear sense of the fog or opaque; 3) tourmaline degree of purity: Tourmaline nature more brittle, prone to fracture while the interior will contain a large number of inclusions, there are a lot of cracks and inclusions will affect tourmaline transparency, color and fire, and inside a very pure tourmaline is relatively rare, are top grade. In the selection, try to pick the inside clean. 4) attention to the selection of tourmaline with special properties: tourmaline rich colors, and the more valuable is in the same tourmaline there are two or more colors appear, that color tourmaline or polychromatic tourmaline, as well as infrared and green watermelon tourmaline It is relatively rare; in addition, tourmaline cat's eye tourmaline in the top grade. Another is Ruby tourmaline, as output less rich color and precious, but often this tourmaline Clarity are poor. Identification of two tourmaline: tourmaline gem and a similar difference is its thermoelectricity. Under irradiation tourmaline heat, friction or the sun, its surface will carry a charge. The charge in the air there is the attraction of opposite charges, can absorb the air with opposite charges dust, paper and the like. This is a unique feature of tourmaline. You can do a simple test by this method. Tourmaline identified three: the common risk tourmaline imitations there are two types, one is a colorless tourmaline from artificial colors; one for red glass processing. Identification method is really tourmaline tend to have distinct dichroism, showing double shadow; tubular body visible inclusions or cotton wool was, was cambered crystal triangular cross-section. These characteristics do not have to take the imitation goods, the workers dye tourmaline, because the color hanging stagnation, lack of natural tourmaline "Glory." Tourmaline identified four: Then we can familiarize yourself with the true characteristics of tourmaline effectively avoid buying fake tourmaline. Usually tourmaline has the following main features: 1) tourmaline density (3.06) than the hand weigh crystal, glass to significantly heavier few; 2) rich color Bi Yuxi is one of the most abundant color gemstone varieties, can also occur on the same crystal different colors, such as yellow and green, pink and yellow, red and blue, and so on; 3) Multicolor and clear in transmitted light at different angles 察碧 seal, its color tone and brightness level will change, and amethyst obvious, the glass does not occur; 1.616-1.650, birefringence of up to 0.044, use a magnifying glass to observe through the tourmaline crystal 4) was significantly birefringence ghosting effect of a refractive index of tourmaline, faceted on the back edge and impurities occur obvious ghosting effect; 5) Electrostatic tourmaline pyroelectric effect, friction and heat, can pick up fine dust and scraps of paper; internal inclusions 6) inclusions of tourmaline often directional linear, tubular vapor-liquid inclusions; Crystal , topaz and other places irregular spots, feather inclusions majority; it will bubble glass, swirl pattern appears. 7) growth pattern for natural tourmaline crystal, the arc triangle parallel cylinders and cylinder extending direction of growth pattern are the main features of the difference of crystal, beryl. Tourmaline identified five: red and pink tourmaline main topaz, red spinel, andalusite and other mixed, by the heavy liquid Identification. How many pieces of rock with a heavy liquid bottle 3.06S / cm3 at the same time to release the heavy liquid in red tourmaline suspension or slowly sinking, and red topaz, red spinel is rapidly sinking, andalusite sinking speed greater than the red tourmaline , which can pick out the red tourmaline. Tourmaline identified six: green tourmaline mainly easy to mix and olivine, green diopside, green garnet. Since the tourmaline has a two-fold greater rate, in the right place can be observed clearly after faceted garnet edge and no ghosting. Internal inclusions of olivine and distinct tourmaline, peridot has characteristics of a water lily-like inclusions within and tourmaline containing typical irregular linear and thin hole, some tourmaline seen a large number of parallel fibers. Tourmaline is a crystal axis in a two refractometer in a shadow move up and down the line, the other one does not move. Through the above text description, I am sure how to identify genuine and fake accents have a preliminary knowledge and understanding, but also hope that when we can buy to buy tourmaline succeed heart wishful products, tourmaline avoid buying fake products.