1, touch mode:
Crystals are all crystals with fast heat transfer, while glass is amorphous with slow heat transfer. 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.
2. Observation of inclusions:
When observed with a jewelry magnifying glass of 20 times, defects such as gas-liquid inclusions, flocs, raw minerals, ice cracks, peeling and so on often appear. And most flawless crystals have problems. Swirl-like fine lines often appear on the surface and inside of the glass, much like the phenomenon caused by uneven stirring after pouring honey into clear water. On the other hand, regarding bubbles, it is said that it is not strict to classify bubbles as glass. First of all, rock crystals may contain bubbles, which are natural gas liquids mixed in the process of crystal growth. Bubbles are fine and moist, like fog in a stone, evenly distributed, like clouds and fog, and full of beauty (if there are many inclusions forming images, they are abnormal crystals, such as white ghosts, etc. ). Inferior glass is really easy to contain bubbles, with irregular shape and arrangement, abrupt feeling and lack of natural unity. But from a realistic point of view, the glass used to counterfeit crystals is often well-made and not too rough, otherwise it can only be fooled in the stalls.
3, fracture identification:
Everyone is familiar with the broken pattern of glass, which is smooth and curved like a dent in 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.
4. Process:
The more precious a gem is, the finer it will be polished. For example, the cutting of diamonds has become an art. The glass fake gem is cheap, so the polishing is rough, the surface is not smooth, 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.
5, optical identification:
Glass is an amorphous isotropic body and crystal is a crystalline anisotropic body. The rock crystal that turns 360 degrees under the polarizer looks bright and dark, but it is actually a fake crystal that has not changed. In addition, some rock crystals, such as amethyst, have dichroism, while pseudocrystals do not.
6, hardness distinction:
The hardness of crystal is 7, and that of glass is about 5.5, so when crystal cuts glass, there is no trace of crystal, but there is trace of glass. 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. Don't use this method to identify non-crystal treasures, such as organic gems such as beeswax, coral, pearls, or jade. 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.
7, hair identification (birefringence):
Hair identification is specifically aimed at spherical crystals: put the crystal on a hair bundle, gently rotate the crystal, and when it rotates in a certain direction, double shadows appear, that is, one hair becomes two, and the effect is clear and obvious. This is a birefringence phenomenon caused by the crystal arrangement of rock crystals, which can not be achieved by 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.
8, thermal conductivity detection:
When the thermal conductivity meter is set to 4 squares of green test gem, the rock crystal can rise to 2 squares of yellow, and when the area is large, it will rise to 1 square yellow, but the pseudocrystal will not rise.
9. Pro-somatosensory test:
As the crystal of the seasonal family, energy vibration and magnetic field effect are their most obvious characteristics, which is also the mystery of different medical effects of crystals, so feeling with your body and mind is the ultimate secret to test rock crystals. In this regard, I will write an article to introduce it.
■ How to distinguish rock crystal, artificial crystal and glass?
1, crystal form
Rock crystal: hexagonal column, triangular biconical shape, condensed, with horizontal stripes and twins on the cylindrical surface, and the crystal surface of water droplets keeps a round bead shape.
Artificial lens: rod-shaped, with a special fish-scale growth line on the surface of the crystal, no crystal, no twisted crystal buds, and a parallel cylinder in the center of the crystal.
Glass: Irregular shape, water droplets immediately spread on its surface.
2. Smooth
Crystal stone: the Ming and Qing dynasties are like water and clear.
Artificial crystal: white luster
Glass: The color of smoke is red.
3. Difficulties
Crystal stone: Morse 7.
Artificial crystal: 6.8-7
Glass: 5.5-6
4. Difficulties
Crystal stone: Morse 7.
Artificial crystal: 6.8-7
Glass: 5.5-6
5. Cleavage fracture
Crystal stone: cleavage-free, conchoidal fracture, parallel fracture, obviously ridged.
Intraocular lens: incomplete shell fracture.
Glass: The fracture surface is parallel and the ridge surface is not obvious.
6. Inclusion characteristics
Crystal stone: the inferior ones are irregular inclusions and cotton wadding bubbles, which are irregular.
Artificial crystal: Regular crumb inclusions and bubbles are in a regular round, oval or slender shape.
Glass: Common regular bubbles and inclusions.
7. Specific gravity
Rock crystal: 2.56-2.66.
Artificial crystal: about 2.6
Glass: 2-2.20
8, feel
Crystal stone: It's obviously cold.
Artificial crystal: There is a cool feeling.
Glass: temperature sensing
8. Optical characteristics
Rock crystal: uniaxial crystal is positive, and the refractive index is 1.544- 1.553.
Artificial crystal: The optical properties are similar to those of rock crystal, and the extinction speed is slower than that of rock crystal.
Glass: The refractive index is about 1.40, and it is completely extinction. Optical glass transmits light under polarization, but there is no extinction phenomenon.