Buy crystal or go to Crystal Street, the city god temple? At least it is highly optional. Remember to bargain. It should be good for you to buy it in a larger crystal shop in Xuhui.
Personally, I prefer Uruguayan purple, the darker amethyst, which looks mysterious and calm.
The following is the identification method, you can have a look:
1, Identification of True and False Crystals
(1) At first glance, rock crystals are often influenced by the environment and always contain some impurities. When observing the sun,
You can see light, uniform, pinstriped or catkin-like substances. Fake crystals are mostly made of inferior crystal slag and glass slag.
After polishing, coloring and imitation, there is no uniform stripe or catkin-like substance.
(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 turns 360 degrees under the polarizer and has four bright and four dark changes, while the fake crystal has no 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 and the human eye can see the double shadow of the hair through the crystal, it is a stone crystal.
Mainly because the crystal has birefringence.
(9) Test with thermal conductivity meter: Adjust the thermal conductivity meter to 4 squares of green to test the gem, and the rock crystal can rise to 2 squares of yellow.
However, if the pseudocrystal does not rise, it will yellow when the area is large.
2. Identification of natural and synthetic crystals
Another feature that distinguishes crystal from synthetic crystal is its luster, and the surface of crystal ornaments presents oily luster.
However, the surface of synthetic crystal ornaments is glass luster, and there is no synthetic crystal with oily luster at present.
Although crystal is not a precious gem, it is more and more loved by men, women and children all over the world because of its unparalleled medical effect and low price.
As a crystal lover, everyone wants to have all kinds of crystals, whether natural or synthetic, but he must want to know his own crystals.
Whether synthetic or natural.
There are a large number of synthetic crystal necklaces in the gem market, including common colorless crystals and dark brown series (including smoke and ink) crystals.
And purple series (including lavender, grayish purple and deep purple),
There are also rare yellow series (light yellow, yellow, golden yellow) crystal necklaces and green series.
Crystal necklace (yellow-green, light green, dark green, dark green). They are inexpensive, adding a lot of elegance to the ladies.
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.
Now colorless crystal necklaces and tea crystal necklaces on the market can be described as natural and synthetic, while colored crystal necklaces are mostly synthetic crystals.
There are fewer real natural colored crystals, and even fewer are used to make necklaces.
The biggest feature of synthetic crystal is that it has a daughter nucleus. It is better to judge whether the synthetic crystal has a crystal nucleus, because the crystal nucleus is generally colorless and long columnar.
The boundary with the surrounding synthetic crystals is clear. However, there are some colorless synthetic crystals on the market recently, because the crystal nucleus and synthetic crystals are colorless,
In addition, there are some natural inclusions in the crystal nucleus or some bubbles between the crystal nucleus and the synthetic crystal, which is easy for some inexperienced people to misunderstand.
This is crystal. If you look closely, you will find that the inclusions in the crystal nucleus only exist in the daughter column, and there is an invisible wall around it.
The feeling of breaking without 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 crystals, there are often inclusions arranged along a plane.
However, this surface is often single and fluctuating, and it will be found that the inclusions forming this surface are mostly two-phase inclusions under the gem microscope.
Not just bubbles. The difference between the two is obvious.
The second characteristic of synthetic crystals, especially color synthetic crystals, is uniform color. The whole necklace is the same color,
Especially yellow crystal series and black-brown synthetic crystals. However, natural yellow is often uneven with brown and black crystals.
Rock crystals are not only uneven in color, but also often have a tawny hue (except tawny crystals). More interestingly, under the incandescent lamp at night,
Brown crystals are exactly like brown crystals without any yellow, but it is difficult to identify them if they are mixed with brown crystals.
The synthetic topaz I have seen is pure and uniform in color, with some darker tones, but no brown.
Do not change color under incandescent lamp at night.
It is worth noting that in synthetic amethyst, there are often some deep purple flakes with good orientation, which are easily associated with natural amethyst.
Characteristics of irregular flake chromophores. The biggest difference between them is that the deep purple clusters in synthetic amethyst are arranged in a nearly parallel sheet orientation.
There is little difference in size and shape, and the boundaries are obvious. However, the color group of natural amethyst is random and irregular, with varying shades and gradual boundaries.
If the purple blocks in synthetic amethyst are compared to floating "purple cloth blocks", then the purple blocks in natural amethyst can be regarded as floating "purple smoke blocks".
This is the main difference between the two.
Another feature of natural colored crystals, especially amethysts, is that they have hexagonal ribbons like sapphires. It is worth noting that,
Recently, parallel bands often appear in some synthetic green crystals, and the bands develop parallel layer by layer along the daughter crystal nucleus wall. I've also seen a string of syntheses.
Green crystal necklace, yellow and green appear alternately, much like the ribbon of rock crystal, with some brown translucent solid impurities in it.
It is easy to mistake it for a natural green crystal, but the color band formed by the synthetic crystal is parallel to the daughter nucleus wall and straight and angular.
The whole string of crystal ribbons in the necklace is the same, and the width and color change of each ribbon are the same, giving people an unnatural feeling of being too "in step".
The third characteristic of synthetic crystal is pure and flawless. There are inclusions and sponges in rock crystals, and the synthetic crystals are crystal clear.
Some synthetic crystals have bubbles or some solid impurities. Recently, some synthetic crystals often have triangular long tubular holes.
There are green or red powders in these holes. This kind of long tube is characterized by parallel arrangement in one direction and triangular cross section.
Uneven green or red powder is often distributed along the wall, the middle is often empty, and the end of the long tube tends to be pointed.
Real natural crystals are crystals containing tourmaline, actinolite, rutile and other minerals, each of which has its own crystal form.
For example, the "bamboo" shape of actinolite. They are wrapped in crystals, randomly arranged without direction, and have different names for their thickness and length.
It is often accompanied by inclusions and sponges inherent in rock crystals.