(1) white crystal: The purest crystal is transparent white crystal, which is often used in jewelry.
(2) Topaz: Topaz is the cheapest of all yellow gems. Among them, amethyst with orange-red color is not natural topaz, but is made of inferior amethyst by heat treatment, although its value is high.
(3) Brown topaz: often called tea crystal, often used in glasses. Its colors are deep and light.
(4) Amethyst: The value is higher than ordinary crystal. Amethyst with good quality is often cut into circles, squares and long facets.
Distinguishing the quality of crystal mainly depends on the color, whether the color is uniform, and whether there are impurities in the stone.
1, don't covet cheap, remember the famous saying of the ages, cheap goods are not good; The value of crystals is differentiated according to different grades. Low-grade goods are naturally surprisingly cheap, while high-grade goods can be embedded in the king's crown as the main stone!
2. Don't be lucky and dream of buying good products at low prices; Although crystal is considered as a semi-precious stone, it doesn't mean that it has no value. At present, the common products on the market can only belong to middle and low-grade products. Although they are also sold by weight, the wholesale price is really low, so even if the retail price is as low as a few dollars, there is still a certain profit margin.
3. In the process of crystal formation, it is often influenced by the environment and always contains some impurities. When observing the sun, you can see tiny and even stripes or catkins. Fake crystals are mostly made of inferior crystal slag and glass slag. After polishing, coloring and imitation, there are no uniform stripes and catkin-like substances.
Even in the dog days of hot summer, licking the surface of the crystal stone with your tongue feels cold and cool. Fake crystals are not cool.
When the crystal is placed vertically in the sun, it can emit beautiful light from any angle. Fake crystals can't.
6. Hardness: Crystal has high hardness. Gently scratch the jewelry with gravel, leaving no trace; If there are streaks, it is a fake crystal.
7. Check with a polarizer: the rock crystal has four bright and four dark changes when it rotates 360 degrees under the polarizer, but the fake crystal has not changed.
8, put the crystal on a hair, the human eye can see the double shadow of the hair through the crystal, it is a rock crystal, mainly because the crystal has birefringence.
Responder: Stefanie Crystal Taobao-Trainee Magician Level 2 1 1-6 22:25
Other answers *** 6
Rock crystals generally contain impurities, crystals, etc. Artificial and synthetic ones are cleaner, and their colors are different from those of natural ones. Natural looks pleasing to the eye, synthetic looks fake, and it's cold in your hand. If you look at them more, you can easily tell them apart.
Respondent: Wang Jing 'ai Kan Wei —— Trainee Magician II 1 1-4 12:52.
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The hardness of the crystal is equivalent to that of a steel file, which cannot be achieved by artificial or synthetic materials.
Well-crystallized crystals usually have a good herringbone fracture with parallel ridges; In amethyst and heat-treated topaz, most of them are uneven sheet fractures.
The chemical formula of the crystal is silicon dioxide. Because it contains different mixtures or mechanical mixtures, it has many colors. Purple and green are caused by iron (Fe2+) ions, purple can also be caused by titanium (Ti4+), and other colors are caused by color centers. The crystals contain sandy and fragmented goethite, hematite, rutile, magnetite, garnet and chlorite. Hair crystals are formed by inclusions containing hairy needle-like minerals visible to the naked eye. Containing manganese and iron is called amethyst; Iron (golden or lemon) is called topaz; Rose color containing manganese and titanium is called rose season; Smoke color is called smoke crystal; Brown is called tea crystal; Black and transparent are called ink crystals; The light green one is called stone pulp.
Answer: nonsense 007- magic apprentice level 111-415:18.
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First of all, you can look at the original stone, the natural crystal is hexagonal, and the synthetic crystal is flaky and strip-shaped, which can be seen at a glance. Again, look at the content. Rock crystals will have some inclusions more or less, but synthetic crystals are completely absent.
Reply: Frozen ~ Summer-Magic Apprentice Level 1 1 1-4 19:28.
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The interior of natural topaz may be very bright and transparent, and the price is extremely expensive.
No matter how good the rock crystal is, there will be some slight impurities.
You can observe whether there are obvious bubbles in it. If there are bubbles, it is glass.
Also observe the expression in your eyes.
Many topaz have changed their colors, and some of them have been changed by crystals, but the certificate will still say "crystal" instead of "natural topaz".
Respondent: Bing Er Dou-probationary period level 1 1 1-5 18:46.
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Crystal type:
According to the crystallization degree of SiO2 _ 2, it can be divided into crystalline single crystal (crystal in a narrow sense), aphanitic chalcedony, agate, jasper, tiger's eye stone, amorphous opal and natural glass. As for others, such as garnet, tourmaline, amber, coral, pearls and so on. They are also classified as crystals, which is the name of natural energy gems widely used in recent years.
Identification method of true and false crystals:
(1) At first glance, rock crystals are often influenced by the environment and always contain some impurities. When you look at the sun, you can see faint or even tiny stripes or catkins. Fake crystals are mostly made of inferior crystal slag and glass slag. After polishing, coloring and imitation, there are no uniform stripes and catkin-like substances.
(2) Lick your tongue: Even in the dog days of hot summer, licking the surface of the crystal stone with your tongue will feel cold and cool. Fake crystals are not cool.
(3) Illumination: When the crystal is placed vertically in the sun, it can emit beautiful light from any angle. Fake crystals can't.
(4) Hardness: The hardness of the crystal is very high, and it will leave no trace when lightly scratched with gravel on the jewelry; If there are streaks, it is a fake crystal.
(5) Inspection with a polarizer: the rock crystal rotates 360 degrees under the polarizer, with four bright and four dark changes, while the fake crystal does not change.
(6) Check with dichroism: natural amethyst has dichroism, while fake amethyst has no dichroism.
(7) Magnifier inspection: under the transmitted light, the bubbles that can be found can be basically classified as pseudocrystals.
(8) Check with hair: If the crystal is placed on a hair, the human eye can see the double shadow of the hair through the crystal, it is a rock crystal, mainly because the crystal has birefringence.
(9) Test with a thermal conductivity meter: set the thermal conductivity meter to 4 squares of green to test the gem, and the rock crystal can rise to 2 squares of yellow, while the false crystal does not rise, and when the area is large, it will rise to 1 square yellow.