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A, true and false crystal identification method:
(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.
(Check with hair: If the crystal is placed on the hair, then the rock crystal is the kind that the human eye can see the double shadow of the hair through the 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.
Second, how to choose crystal products?
A look at the selection of materials: crystal products with excellent selection of materials should not see gas-liquid inclusions with star-shaped, cloud-like and flocculent distribution. The texture is pure, smooth and crystal clear. If cracks and spots of different shades are found, they are defective.
Second, look at the workmanship: there are two kinds of processing techniques for crystal products, namely grinding and carving. Such as crystal necklaces, bracelets, earrings, etc. Belonging to abrasive products; Guanyin statue, painted snuff bottle, etc. It belongs to sculpture. A well-made crystal product should be exquisite, which can fully show the external beauty (shape, style, symmetry, etc. ) crystal products, but also to maximize its inner beauty (crystal clear, smart color).
Third, look at polishing: the quality of polishing directly affects the value of crystal products. The crystal must be polished with emery during processing, and rough production will make the surface of the crystal have friction marks. Good crystal products have good natural transparency and luster, which is "burning with fire" in the local dialect.
Fourth, look at the eye hole: for crystal products (such as necklaces, bracelets, beads), it depends on whether the eye hole is straight, whether the thickness of the hole is symmetrical, and whether there are small cracks. The hole wall must be clear and transparent without "white spots".
Look at the color: even the same crystal, the texture and color of different parts are different. It belongs to monochrome, and the chromaticity should be uniform; If there are tones on the same crystal, it is required that the tone lines are beautiful and generous.
Sixth, look at coordination: when buying crystal ornaments, try them on, depending on size, tightness and length. If it is inlaid ornaments, see if it is firm, straight and harmonious. You should also pay attention to whether the style and color of crystal ornaments are in harmony with your figure, skin color, face shape and clothing.
General tips for distinguishing crystals are as follows:
Identification of inclusions: Because rock crystals are naturally generated from the earth, there are usually inclusions, natural ice cracks, clouds and ribbon changes in the crystals. Don't think that is a sign of inferior crystal. ) Artificial crystals are synthesized and concentrated in factories or laboratories, so the crystals produced are almost flawless. So when choosing a crystal, if you see the above situation, it is almost certain to be a rock crystal.
Birefringence: The crystal has the characteristic of birefringence. So put a hair or a straight line under the crystal. You will see two images. However, some artificial crystals have been able to achieve birefringence. Therefore, the distinction between laws is not high. (It is recommended to use other identification methods as a guarantee before using this method. )
Magnetic induction method: Hold two rock crystal pieces with thumb, forefinger and middle finger, the distance between the two fingers is about several centimeters, and slowly pull apart and approach each other. (Slowly) you can feel a kind of magnetic force similar to the attraction and repulsion of magnets, especially crystal balls and columns, especially high-grade crystals, which will not happen in non-rock crystals, including synthetic crystals. However, this method is suitable for hands sensitive to crystal magnetic field (such as smooth girls' hands, which I am not allowed to do ~ ~). But people's feelings are inevitably subjective, and some people may have illusions when using this method. (It is also the last time to use this method. )
Gloss observation method (very practical, it will be obvious if you can find fake crystals): the surface of rock crystal ornaments is oily, while the surface of synthetic crystal ornaments is glassy (just too bright), and there is no synthetic crystal with oily luster. This method is practical, and it is recommended to use it together with the first one.
Nucleus discrimination method: the biggest feature of synthetic crystals is that they have daughter nuclei. It is easy to judge whether a synthetic crystal has a crystal nucleus, because the crystal nucleus is generally a colorless long plate column with a clear boundary with the surrounding synthetic crystal. However, some colorless synthetic crystals on the market recently are colorless. In addition, there are some characteristics of natural inclusions in the crystal nucleus or some bubbles between the crystal nucleus and the synthetic crystal, which makes it easy for some inexperienced people to mistake them for rock crystals. Careful observation shows that the inclusions in the crystal nucleus only exist in the subnuclear column, and there is a feeling of being blocked around by an invisible wall without any delay. The bubbles between the crystal nucleus and the synthetic crystal are distributed along the crystal nucleus wall, forming a "bubble wall" which is parallel to each other. Some bubbles are tadpole-shaped, and the head is arranged outward towards the wall and tail. In rock crystals, groups of inclusions are often arranged along a surface, but this surface is often single and fluctuating, and the inclusions that make up this surface are mostly two-phase inclusions, not just bubbles. The difference between the two is obvious. However, nowadays, crystal merchants usually have a general inspection before selling, which makes your chances of finding the secret very slim.
Crystal identification skills are almost finished ~
In addition, there are a large number of synthetic crystal necklaces in the gem market, such as those made of common colorless crystals, dark brown series (including smoky gray and dark brown) and purple series (including lavender, grayish purple and deep purple), and those made of yellow series (light yellow, yellow and golden yellow) and green series (yellow-green, light green, dark green and dark green). They add a lot of elegance to ladies with good quality and low price. However, some crystal merchants are unwilling to admit that their crystals are synthetic, and often sell synthetic crystal necklaces with "rock crystal necklaces". So it is necessary to identify whether it is a synthetic crystal necklace or a rock crystal necklace.
These methods are relatively easy to learn.
Specific gravity: too light must be false, so that imitations such as glass, plastic and pressed particles can be excluded. However, there are many crystals on the market now, the weight of which is similar to that of rock crystal, so it is not easy to find the authenticity by hand. Drawing glass with crystals is not suitable for long crystals. )
Refractive index: most people like to look at the crystal under the lamp, so they can't judge whether the crystal is true or not, but only the grade of the crystal, because the refractive index of the crystal is very high. We can put the crystal in a dark place. The color of the rock crystal will be very bright, and the color of the crystal will be dim, lacking the sense of "spirit" and only slightly bright. You can use natural white crystal and glass to compare and feel it. Rock crystal feels cooler than a growing crystal.
Price: Crystal cultivation is similar to natural gem-grade crystal, that is, the crystal is extremely transparent, with almost no stone particles, but the price is very different. Usually, crystal training bracelets will be cut into sections. Crystal is transparent, but the price is generally not too high. However, if it is really a natural gem, the price must be above 100 yuan, depending on the size of the crystal.
Color difference: Crystal has color difference, so it is impossible for every part of a crystal to have a uniform color, such as amethyst, which is rare in the market. Natural amethyst can be identified by putting it in water. Natural amethyst is uneven in color in water. Usually one color radiates to the whole crystal, which is purple, so the crystal color is absolutely uniform.
Others: it feels very cold, and the crystals with stone lines are basically not fake. Example: Powder crystals have many natural cracks.
Inclusions: If there are inclusions, there will be no fakes, so you can buy crystals with inclusions such as hair crystals and ghosts with absolute confidence, because the cost of forging such things is very expensive and laborious, and the effect is easy to see through.
Hibiscus crystal: 20 ~ 80/ piece
45/ sheet 5mm* 10mmr with 8 characters.
Heart-shaped 10mm 35 yuan ~ 50 yuan (one of them is icy).
White crystal: 6mm faceted round beads 25 ~ 35 yuan/strip.
10mm 40 ~ 60 yuan/piece
40 ~ 60 yuan 12mm/ piece.
Bead with faceted 10mm 40 ~ 60 yuan/strip.
Hair crystal: there are all kinds of colors, but they are basically light.
Faceless round beads 100 Yuan ~ 120 yuan/strip.
Blonde essence: 180 ~ 300/ piece, so expensive. I remember when I bought it last year, it was only 2/3 of it.
Sapphire: 6 mm round beads, without facets, 100 ~ 150 yuan/8 mm each.
Green Ghost: 150 ~ 800 yuan/each. By the way, there are actually more than 50, but there are no ghosts.
Amethyst: 50 ~ 300/ piece
The above is only the approximate price, and it may go up.
In Guangzhou, crystal agate is worthless. A string of pink crystal bracelets costs 20 yuan to 30 yuan, and a small amethyst bracelet costs 100 yuan. Not to mention agate! Here I'll tell you about the order of crystals from cheap to expensive.
Heishiyao (Opal)-Powder Crystal-White Crystal-Amethyst-Tea Crystal-Green Ghost-Amethyst-Topaz-White Hair Crystal-Tea Crystal-Yellow Hair Crystal-Tourmaline
This can only be used as a reference and may not be accurate. Sometimes the price depends on whether the lines in Stone Crystal are clear and beautiful, and the venue is also very important. Domestic crystals are very cheap, while Brazilian crystals are very expensive, but at present, the crystals sold in China are basically imported from Guangzhou, so they are profiteering ~!
Natural crystal ball reference price
Crystal ball model (cm) price
2.5 15
3.0 30
3.5 50
4.0 80
4.5 120
5.0 160
5.5 240
6.0 320
6.5 450
7.0 560
7.5700
8.0 780
The above prices are the reference prices of natural crystal balls (including impurities). The effect is the same as that of synthetic pure crystal.
As for the natural A-level crystal ball, it can be sold above 400 yuan as long as it is 4cm. If it contains crystals or special scenery, the price will be higher.