1) At first glance, in the process of rock crystal formation, it is often influenced by the environment and always contains some impurities. When we look at the sun, we can see tiny and even stripes or catkins. The fake crystals are mostly made of inferior crystal slag and glass slag, which are melted, polished and colored, without 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) 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.
(4) Inspection with a polarizer: when rotated 360 degrees under the polarizer, the rock crystal with four bright and four dark changes, and the pseudocrystal without change.
(5) Check with dichroism: natural amethyst has dichroism, while fake amethyst has no dichroism.
(6) Magnifier inspection: under the transmitted light, the bubbles that can be found can basically be classified as pseudocrystals.
(7) 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.
(8) 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.
The difference between crystal and glass
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; The Guanyin statue and snuff bottle painted in it belong 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.
Look at the color: even the same crystal, the texture and color of different parts are different. It belongs to monochrome. If the chromaticity is uniform and there are shades on the same crystal, it is required that its tone texture is 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.
To reiterate the most important point-there are countless ways to tell whether a crystal is true or not, which seems simple. In fact, just reading these boring words is really impossible. Some businessmen try to sell the crystal at a higher price, such as coloring it, bonding it, changing the color by radiation and so on. Non-professional sellers are difficult to distinguish. Even some crystal sellers may not be able to distinguish them without instruments. Find a knowledgeable, enthusiastic and honest seller.