How to identify with the naked eye gemstone quality is good or bad

Whether ordinary consumers or jewelers are often in the field in gemstone trading, so grasp quickly and accurately is crucial gem identification method is simple and economical. Visual identification method may well be an effective way to comply with the above requirements. China and Hong Kong Limited www.gaoshijiage.com wholesale zircon zircon focused on providing wholesale, to provide you with Arrows zircon price online consultation order. ? Essence of visual identification method is based on unique gemstone color, transparency, gloss, hardness, specific gravity, inclusions, dispersion, cleavage, fracture, birefringence, special optical effects and other features, using simple tools, such as more than 10 times the magnifying glass , concentrating flashlights and other identification. According to the theory of visual identification law: characteristics they look different gemstone shape, physical properties, etc. are not the same. The vast majority of gem can be assigned to a certain characteristics according to its approximate range experienced this range may be reduced to twenty-three kinds even accurately determined. As in the current market, someone will Malay jade green chalcedony and other mistaken for high-grade jade; red spinel as ruby; artifact natural products ...... when, in fact, once you have a special gem trunk, no or little use to identify equipment, also Identification can be done accurately. Now naked eye gem identification methods described below: 1) Look at the color first thing to note is the observation of the color gems. Whatever gem, identification number with a range of different colors and jewel tones and has narrowed. Olivine special olive green colors, so we hit it off. Few gems are bright emerald green, such as emerald, garnet, and some stained emerald gem. Black stones only black diamond, coal crystal, tourmaline, diopside, obsidian rock. Purple gemstone amethyst, purple sapphire, spinel, cubic zirconia. When identification jade, jade and green chalcedony Malaysia, if carefully observed, can be found jade green distribution is uneven, irregular-shaped fracture is dull fracture, Malaysia jade color distribution into filamentous, shiny glass-like fracture and there is a sense of sand, green chalcedony milky color sense and evenly distributed. Dyed jade color is not natural, and less concentrated in fissures, true-color natural emerald color, the distribution would naturally. Ruby and spinel visually identified, showing how much the ruby ??with multicolor, placed in the water, sometimes visible hexagonal ribbon and red spinel color is absolutely uniform. 2) Look Transparency Transparency can be used to understand the pros and cons gem. Generally speaking, the same kind of gem, transparency Zhao Gao is more precious. Transparency can also be used to identify similar color but different types of stones. Such as spinel and purple teeth black in color similar, but spinel is transparent, some are purple teeth black opaque or translucent. Topaz and sapphire as well. Topaz is a transparent crystal, sapphire is transparent, translucent to opaque distinction. Olivine is a transparent crystal, but it is similar to the color of jasper and some species are not transparent. 3) look shiny gem gloss is an important basis for visual identification, we can roughly determine the scope of a satisfactory refraction. Gloss is determined by the degree of smoothing and polishing the surface of the high and low refractive index. Unknown gem gloss, the stronger the higher the refractive index, half adamantine luster refractive gem on the refractometer scale falls high refractive index range, with shiny glass stones rub refractive index in the range, and half work shiny gem refractive index in the lower range. With waxy, shiny surface oil sheen polished jade relatively poor, there are many gems silky luster legend needle inclusions. With a gloss of resins may be amber, cut into cabochon have swim-color, translucent, cloudy, milky white luster by a sky blue long ice moonstones. Pearly luster is albite moonstones, yellowish-brown tone blue sheen is stretched moonstones. Blinking in the sunlight blinding light golden stone by the sun. Diamonds with typical adamantine luster. 4) hardness test some similar appearance stones, as long as their hardness test can distinguish. For example, diamond, zircon, crystal, etc., despite a similar appearance, but the hardness is different. Diamonds can scratch zircon, crystal, and the crystal can not scratch zircon. Again, ruby, red spinel, red tourmaline, purple teeth black and other colors are red gem, know their different hardness by scratching can be compared to distinguish. The main gem hardness as follows: --10 diamond, ruby ??and sapphire --9, chrysoberyl cat's eye --8.5, spinel --8, --8 topaz, zircon --7.5-8, emerald - 7.5 tourmaline --7-7.5; crystal --7, purple teeth black --6.5-7.5, olivine --6.5-7, opal --5.5. Use hardness distinguish gems need to note the following: This method has two limitations. First, some similar colored gems are similar in hardness, such as zircon and purple teeth black; the second is the artificial gems powerless, because in the physical properties of synthetic gemstones and natural gemstones are very similar. Do not force the test too fast, especially not knocked scored, but to slowly drag scored. Do not light up the test from one direction, but in different directions to test the hardness of stones because the individual is not the same in different directions. Such as kyanite extend in terms of crystal hardness of 4.5 degrees, with a knife can be engraved move, and in the vertical direction and its hardness is high to more than 6 degrees. Precious stones, especially precious stones, not just scoring. Relatively safe and reliable method is to use a good mineral polished film grinding test. For example, to distinguish the authenticity of gemstones through, can it scored synthetic spinel polished film (hardness 8), if it scratches on the artificial spinel, that it must be more than 8 degrees of hardness, it There may be a ruby. 5) the amount of the proportion of hand Dian Dian gem estimated proportion is experienced appraisers secret trick, to more practice to master. Such as diamond and cubic zirconia colorless artificial eye view of the proportion of 3.52 resembles diamond, cubic zirconia proportion of 5.8, the same size of the ring face, hand a weigh, the light for diamonds. Or Grossly turn gemstone diameter, hand Dian Dian can roughly estimate the specific gravity and the weight of the stone. When conditions permit, can be gravimetric method is: with a jewelry store with weekday weighing scales. At one end to hang a very thin gold or copper are made of small blue gem into the first basket in the air weighing, the weight of precious stones in the air. Then will be equipped with small blue gemstone jewelry, immersed in a glass filled with water to reduce the scale of the weight, this is the gem weight in water, then, according to the principles of physics, objects in the weight loss of water, equal to body the weight of the same volume of water discharged (but the water used to 15 ℃ or 60F of distilled water for the standard). Therefore, the formula is as follows: gravity = weight in air / weight in air - weight in water and then according to the proportion of the number of stones, found in the table corresponds to the proportion of gem name. Corresponding to a lot of jewels, but also comprehensive analysis of hardness, color, etc., to determine the gem name. There is a more reliable method is heavy liquid method, that is out of proportion to be measured against the same proportion of liquid gems, precious stones into the liquid and then see if the sink is floating. For example, the proportion of jade is 3.33, placing it 3.2 grams per cubic centimeter heavy liquid, the emerald due to gravity is greater than the weight of the liquid nature will sink, if floating on an emerald. Of course, heavy liquid formulation requires a certain raw material, the operation is not very easy. Features 10 times magnifying glass transparent stones inclusions 6) observed inclusions, it is the most reliable way to distinguish between natural and man-made chemicals. Natural gemstone inclusions can be solid, liquid, gas, more than a crystalline solid; most artificial gemstones bubbles, spin-like pattern of solid inclusions in synthetic gemstones inclusions. 7) Look dispersion upside down in a transparent gem, the dispersion intensity can provide important clues for identification. Only diamonds, synthetic cubic zirconia, zircon, rutile, green garnet, cassiterite, etc. with the naked eye can see significant dispersion. 8) See the fracture and cleavage fracture and fracture surface gloss which, on the identification of some gem is of particular importance. Most gem with vitreous luster is conchoidal fracture, translucent and opaque jade more granular, irregular-shaped fracture. Such as coral fracture is dull, irregular-shaped fracture; fracture amber resin luster, conchoidal fracture; chalcedony, agate resin fracture luster, conchoidal fracture; turquoise dark oil sheen, granular or conchoidal fracture; aventurite, Aventurine granular, irregular-shaped fracture. Cleavage is also one of the bases of gem identification, only a few gems have significant cleavage, such as diamonds, topaz and so on. 9) birefringence and pleochroism with 10 times the magnifying glass to see the part of the turn-type transparent gem at the edge double vision, this feature is also an important basis for gem identification. With strong double image properties common gem just zircon, peridot, tourmaline, rutile. Part of colored gemstones dichroism can see with the naked eye. Blue-green and brown tourmaline green dichroism and ruby, sapphire, zircon, andalusite, change simply by turning the gem stone you can see a clear dichroism. 10) See special optical effects of certain gemstones have special optical effects, any kind of optical phenomena, are likely to reduce the unknown gems forecast range. Will turn gemstone top side down, is placed on a white background, a pen-type sample is illuminated from different angles at the bottom of the barrel, reflecting see if the flat surface or a red circle around the waist, it may be purple teeth black or glass stone floor, note the sample red, purple or thin see red circle. Red flash from the deep shades of bright blue gems can be considered as synthetic spinel stone or Tanzania. Individual gemstones in different light source to produce a color change. Alexandrite in natural light purple blue, red and purple tungsten lamp light. Adularia iridescence change color in different light. Opal special multicolored color change. Often appear in the aquamarine flakes flash. Common riparian light gems are ruby, sapphire, QUARTZ, purple teeth black. Star radiance gem spinel, pyroxene, hornblende, if the amount of light of a fine gem and obviously, the other broad and vague, under a magnifying glass to see a lot of seemingly metallic inclusions, it is 石星光 diopside gemstone. Common opal gem gold emerald, quartz, aquamarine, tourmaline, feldspar, like the eye of the tiger tour color, Hawkeye's wood becomes stone. China and Hong Kong Limited www.gaoshipifa.com provide wholesale zircon zircon factory, zircon prices Online Order. ?