In addition to buying jade as a accessories, more friends have a greater interest in jade collection, here to share the true and false of jade jewelry to buy jade jewelry.
Identify with the naked eye:
Familiar with true jade. There are only two kinds of recognized real jade, jade and nephrite.
Among them, the most expensive and most popular jade (Burma Jade, Burmese jade, Emperor Jade and Hetian jade) are mainly produced in Myanmar, while Guatemala, Mexico and Russia also produce a small amount of jade.
Seventy-five percent of the world's jade is produced from the British Columbia jade mine, all of which are nephrite. China, Taiwan, the United States and Australia (a small number) also have nephrite production.
Familiar with imitation jade. Materials used to imitate jade include:
Serpentine (also known as "new jade" or "olive jade")
Grape stone
Star stone
Calcium aluminum garnet (also known as "Deranshwa jade")
Green Chalcedony (also known as "Australian Jade" - mainly produced in Queensland and Australia)
Malaysian jade (a transparent quartz that can be permanently colored, often named after its color, such as ruby, topaz, blue jade, etc.)
White marble (also known as "mountain jade", mainly produced in Asia, often dyed in bright colors)
New Zealand jade, local Maori residents value Greenstone and New Zealand greenstone. They divide greenstone into four categories according to color and transparency: kawakawa, kahurangi, Ä«nanga. Three belong to nephrite, and the fourth, tangiwai from Milford Sound, is expensive, but is considered by the world to be a real-priced Baowenyu.
Observe the texture. If you have the conditions, you can use a 10x magnifying glass to observe the internal mechanism of jade. Can you see fibrous or granulated textures that are entangled like asbestos? If there is, this jade may be real nephrite or jade. On the other hand, green chalcedony is a collection of microcrystals that look uniform under a magnifying glass.
If you see a layered texture under the magnifying glass, then you may have a layer or even two other layers on the jade (sometimes the merchant will superimpose a thin layer of jade on other stones to achieve the purpose of the fish. ).
Learn to know how to deceive. Even if you have a piece of real jade in your hand, there is no guarantee that it will not be passive. Common tricks include: dyeing, bleaching, adding polymer stabilizers or superimposing with other materials. According to the degree of adulteration, jade can be roughly divided into the following categories:
Grade A: Pure jade, except for the traditional processing steps (ie cleaning with plum juice and polishing with beeswax), did not do any hands and feet (such as high temperature processing or high pressure processing). The color of this jade is pure and pure.
Grade B: This jade is bleached to remove the enamel, and the centrifuge is used to inject the polymer to increase transparency while the surface is covered with a hard, transparent plastic. This jade has an unstable character and is prone to fading over time because the polymer is easily damaged by heat and detergent. But in any case, this jade still maintains 100% natural color, still 100% pure jade.
Grade C: This jade is bleached and dyed. It is very easy to fade if it is exposed to strong light, body temperature and detergent for a long time.
Throw the jade and catch it with the palm of your hand. The density of real jade is very high, so it actually looks a little heavier than it looks. If the jade in your hand is heavier than other jade of the same size, and there is no problem in observing it, then it is very likely that it is true jade.
Of course, this method is not very precise, but it is easy to implement and scientific. Previous gem merchants used this method to identify true jade.
Listening to the sound: Another traditional way to judge the authenticity without measuring the density is to listen to the sound. First, listen to the sound of the plastic beads knocking on each other, then find a jade that you have determined to be true jade, and compare it with the jade you want to test. Gently strike, if it sounds like the sound of plastic beads, then the jade you tested is likely to be fake; if the sound is a little deeper and louder, it may be true.
Feel by hand. Holding the jade in his hand, the real jade should be cold and smooth, a little like the feeling of holding soap. It takes a while for Zhenyu to warm up in his hands. This method is especially suitable for identifying jade of the same shape and size.
Scratch test:
Emerald is very hard, it can cut glass or even metal. The nephrite is a bit softer, so if the test method is not correct, it may destroy a real nephrite. In addition, even if the jade in the test can cut glass or steel plate, it may be just some special hard jade, such as various green quartz and grape stone.
Look for a blunt pair of scissors, gently press down on the jade, and then draw a small mark. Scratches should be placed at the bottom of the jade as much as possible so that it is not too obvious.
If there is a windy phenomenon on the surface of the jade, this method cannot be used, otherwise it is easy to damage the jade. If the scratches are white, gently rub it (the white powder may be just the metal powder on the scissors) to see if there are any scratches? If there is, then this piece of jade is unlikely to be true.
Density test:
Calculate the density. The density of jade and nephrite is very high (3.3 for jade and 2.95 for nephrite). The density is calculated by dividing the weight (in grams) by the volume (unit: cubic centimeter).
Use a crocodile clip to grab the jade. If the spring scale you bought does not have an alligator clip, look for a thin wire, rubber band or hair band to tie the jade.
Lift the top of the spring scale and measure the weight of the jade. Record gravity. To use the spring scale in grams, the calculated gravity is the unit of the unit.
Gently immerse the jade in water and record its gravity in the water. The alligator clip can touch the water surface without affecting the weight measurement.
If you are still not at ease, you can replace it with the rubber band and other things mentioned above. However, since this test is based on the difference in gravity measured twice, whether you use thin lines, rubber bands or hair bands, their gravity is offset when the gravity difference is finally calculated, so it does not affect the calculation results.
Calculate the jade volume. Divide the value obtained by weighing in the air by 1000 (if it is a calculator, for the sake of accuracy, or divide by 981), and then weigh the value in water by 1000 (or 981), and subtract the latter result from the latter. the result of. This is actually the weight of the jade in the air minus the apparent weight in the water, the volume of the jade (buoyancy = pVG).
Compared with the density of true jade. Once the density of the jade is calculated, it can be compared with the density of the real jade. The density of jadeite is 3.20-3.33g/cc, while the density of nephrite is 2.98-3.33g/cc.
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