At present, many topaz in the domestic market are made of amethyst after heating and fading. The color is light, there is no glamorous feeling, and the tone is a little thin. Although they all come from the right time, the value of this topaz is not as high as that of natural topaz. For topaz with light color, some jewelers will also enhance the color of the gem by irradiation to make it look more gorgeous. This kind of topaz is widely accepted by the public because of its large quantity, low price and no discoloration at room temperature. Gem topaz is extremely rare, and orange is the best. Powerful energy, commonly known as the stone of wealth, can enhance the yellow light of the gas field and affect material life and wealth. Therefore, combining topaz with the financial position at home or in the office can greatly enhance wealth. So how to identify the authenticity of topaz? Summarize several identification methods and share them with you.
Identification method of natural topaz
Touch method: crystals are all crystals, which transfer heat quickly, while glass is amorphous, which transfers heat slowly. Therefore, holding the crystal will make you feel cold, and after wearing it for a short time, it will synchronize with your body temperature; And glass has a sense of temperature.
Inclusions observation: Observed with a jewelry magnifying glass of 20 times, there are often natural gas liquid inclusions, flocs, primary minerals, ice cracks, spalling and other defects in the crystals, and most flawless crystals have problems. Swirl-like thin lines often appear on the surface and inside of glass.
Fracture identification: everyone is familiar with the pattern of glass fracture, which is a smooth and curved dent, like a shell; Crystal is an ore, the texture of the stone can be seen at the fracture, and the crystal is a crystal, and there will be no traces like glass on the cross section.
The more precious a gem is, the finer it is polished. For example, the cutting of diamonds becomes an art, and the glass fake gem is cheap, so the polishing is rough, the surface is uneven, the intersecting edges between facets are not straight, and the small hole is not delicate-especially this small hole is brittle and easy to break at the small hole, which is just for fracture observation.
Optical identification: glass is amorphous isotropic and crystal is crystalline anisotropic. Rotating 360 degrees under the polarizer, it seems that the rock crystal is bright and dark, but it is actually a false crystal that has not changed. In addition, some rock crystals, such as amethyst, have dichroism, while pseudocrystals do not.
Hardness distinction The hardness of crystal is 7, and that of glass is usually about 5.5, so when crystal cuts glass, the crystal has no trace and the glass has traces. If you like, you can try it on the glass in the part where the jewelry is not obvious. ) Love tip: Hardness test is only for crystal gemstones.
Topaz, don't use this method to identify non-crystalline treasures, such as organic gems such as beeswax, coral, clams, pearls, or jadeite. In addition, from the gemological point of view, hardness and brittleness are two concepts, that is to say, hardness does not mean that it is not bad to fall, so we must first understand the specific physical properties of the baby before doing it, and don't be too barbaric when wearing it.
Hairpin (birefringence) hairpin is specially designed for spherical crystal: put the crystal on a hair bundle and gently turn the spar. When it turns to a certain direction, double shadow appears, that is, one hair becomes two, and the effect is clear and obvious. This is a birefringence phenomenon caused by crystal arrangement in rock crystals, which is impossible for pseudocrystals. The more obvious the double shadow effect, the better the crystal quality. Some rock crystals with too many impurities may not be double-folded, or their hair will be twisted and straight lines will be broken, so the quality of the crystals is even worse.
Thermal conductivity detection: Adjust the thermal conductivity meter to 4 squares for green gem detection, and the rock crystal can rise to 2 squares of yellow, and when the area is large, it will rise to 1 square yellow, and the pseudocrystal will not rise.
Matters needing attention
To sum up the essentials: the simplest way is to really use cotton wool; False with bubbles; Nothing depends on color, color is unnatural and false; Look at the broken incision, regular glass, irregular crystal; Experience, the most practical method, I hope it will help you.