Is the jade sold online true?

Jade can be divided into nephrite and jadeite, also known as jadeite. From the chemical composition, nephrite is a silicate containing calcium, magnesium and iron, while jadeite is a silicate containing sodium and aluminum.

Here are several common methods to identify true and false jade articles:

Identification method of (1) water

Drop a drop of water on the jade. If it becomes dew, it will be real jade if it persists for a long time.

(2) Touch by hand

If it is real jade, it feels cold and lubricated by hand.

(3) Observation method

Looking at jade under the light, it is a real jade with clear color and even green distribution.

(4) tip identification method

The real jade on the tip of the tongue is astringent, but the fake jade is not.

In addition, you can also observe with a magnifying glass, mainly to see if there are cracks, and the value of cracks is greatly reduced.

Jade quality appraisal

There are six criteria to identify the quality of jade, namely "color, transparency, uniformity, shape, percussion and luster".

(1) color

Green is the best jade, and the value of red and purple jade is only 1/5 of green jade. If jade contains red, purple, green and white, it is called "Fulu Xi Shou"; If it only contains red, green and white, it is "Fu Lushou". The dull and yellow ones are inferior. If it is monochrome jade, the color is better.

(2) Pass

Transparent and crystal clear as glass, no dirty spots, no chaff and no astringency is the top grade. Translucent and opaque jade are called intermediate jade and ordinary jade respectively. Before and during the Qing Dynasty, jade with red, green and white colors was called jadeite. In modern times, jadeite refers to generally transparent jade. At present, jadeite is transparent and green.

(3) uniforms

The color of jade is uniform. Although it contains white and green, the color is uneven, so the value is very low.

(4) Shape

The shape of jade can be processed into different styles according to different aesthetic requirements, and there is no special standard. Generally speaking, the bigger the jade, the better.

(5) Knock on the door

Jadeite often has cracks and cuts, which are generally not easy to observe. If you knock with a metal bar or gently throw jade on the counter, you can tell whether there is a crack from the clear voice. The louder, the better.

(6) according to

Emerald has black spots and flaws that are not easy to find with the naked eye. As long as you take pictures with a magnifying glass of 10 times, you can have a panoramic view.

The quality of jade can be divided into 10 grades, and each grade can be subdivided into three grades: upper, middle and lower. Among them, white jade has the lowest value regardless of color and transparency.

Natural jadeite is characterized by slight light color, without light blue (commonly known as evil color). There is also a synthetic jade, which is made of jade powder, crystal and salt water, and looks like a dark "old pit jade". The identification method is very simple, because it is different from natural jade in proportion. It can be said by hand or with a balance, and the heaviest one is the real jade.

At present, some exquisite fake jade is often mixed in the market. The general methods to identify fake jade are watching, listening and testing.

(1) Look

Mainly depends on the crystal transparency, internal structure, luster and so on. Real jade is transparent, oily and shiny, with natural patterns, and the internal fiber state is not easy to imitate.

2. Listen

Real jade sounds crisp, while fake jade sounds dull.

(3) measurement

Mainly to measure hardness. With the glass plate (friction hardness of 5.5) as the standard, except jadeite and turquoise, stripes can generally be drawn on the glass plate, and jadeite itself is complete. Fake jade is generally soft and can't scrape the glass.

Common fake jade is generally made of plastic and glass. They are all amorphous materials with low hardness and low density, and they are also the essential characteristics of materials. Plastic, for example, can be picked with a steel needle or floated gently in your hand. Glass is bubble-like under light or sunlight, and amorphous under polarizer (there is no periodic change of light and shade when rotating), and there are raw materials for making spiral stripes.

Among many members of the jade family, pushing jade is the most precious. It is a natural ore with extremely high hardness and little output. Its colors are mainly green and red. Red is scarlet and green is emerald, hence the name jade.

Classification of (1) jadeite

(1) Super grade: bright green (emerald), apple green, glass floor (translucent, fine texture), even and bright, without impurities and cracks.

Commodity grade: green, oily green land, slightly transparent, translucent grandmother green veinlets and mottled green.

③ Ordinary grade: lotus root powder mill, bean green, light green, fine white and slightly transparent. Opaque jadeite is generally only used as jade ornaments.

Quality identification of jadeite jade

1 texture. Natural jadeite is transparent or translucent in texture, and its surface is bright and shiny. If you look closely, you can see the nearly round and slightly transparent "salt particles" and the fibrous substances around them.

② Hardness. Natural jadeite is jadeite, and its Mohs hardness is 7 degrees. It will be carved by a sharp knife without leaving any trace. The hardness of fake jade is low, so a sharp knife can draw it out.

3 Emerald. When natural jadeite is observed under strong light, emeralds with other mineral particles can be seen, which are called Cui Hua or emeralds. Fakes made of glass, plastic and porcelain have no such "emerald" characteristics.

④ Relative density (specific gravity). Natural jadeite has a hard and dense structure, no bubbles, high density, and clear sound when knocking; Fake products have loose structure or bubbles, low density and hoarse knocking sound.

⑤ color. The real product is rich and pure emerald color. Some fakes are made of white jade, serpentine, Australian jade, Han Guoyu, marble and even various stones. After decoloring, it is filled with high-hardness plastic slurry and colored, or soaked in green liquid to make "colorful jade". Observing under strong light, you can see green lines, which are messy and small; Some do not show lines, but they are not clear, with poor gloss and lighter weight than the real thing.

Put the fake into the melted wax liquid, and the injected pigment will slowly separate out. In this way, the detected sample will not be destroyed, and the authenticity can also be identified.

Observed by Celsi filter, the added emerald is purplish red under the mirror, and the natural genuine color remains unchanged.

Some fake jadeites are artificially melted by glass, with loose structure, uniform and dark green color, some with bubbles, and hoarse when struck with hard instruments.

(3) the choice of jadeite

1 Look at the color. See if the color is pure, rich and uniform, and use a spotlight flashlight to check whether there are hidden variegated colors. Rich, pure and uniform color, less impurities. Emerald green has a higher price, followed by red and purple. Among the greens, Mabel Miao, which is tender and yellowish, is the best, followed by ruby green, river green and oil green, and the green is evenly distributed.

② Observe the transparency. Observing under strong light, the higher the transparency, the better.

3 Listen to the sound. The knock on the door is crisp and pleasant.

④ Observe emeralds and stone flowers. According to light observation, jadeite has the flash of other mineral particles (namely emerald), and there are often massive white flowers called stone flowers. Both of them get twice the result with half the effort.

⑤ Look at cracks and dark spots. Some cracks exist in the raw ore, and some are caused by processing, so the less the better; Black spots are everywhere in jadeite, so it is better to have fewer and smaller ones.

⑥ Look at the processing level. Smooth surface, good polishing and good shape are preferred.

How to distinguish real agate from fake agate?

The most striking sign that natural agate is different from fake agate is that its cross section has concentric layered structure. With this logo, the whole agate is easier to identify, and the cut finished product is easy to admit mistakes because there is no neat and obvious pattern. But generally speaking, natural agate feels cool, its surface looks like a layer of wax, and it has the luster of wax, translucency and hardness of Mohs 7, so it can't be carved with a knife, because the crystals formed in the molten state are mostly spherical, so it is particularly dense; After polishing, the surface is more delicate. After rubbing on the hard miscellaneous board for more than ten times, the agate was not scalded, but the board was scalded. Colors are often mixed together to form beautiful patterns such as patterns, layering and brocade.

In addition to artificial synthesis, some fake agates are made of high-quality stones. Its basic characteristics are: it feels cool, but it has no waxy feeling and luster, and some of it has low hardness and can be carved with a knife; Breaking the observation section, except agate has a layered feeling, the particles are thicker and even cracked; Opaque, with clear boundaries between colors. Some unscrupulous traders stick a thin layer of organic matter on the surface of fake agate, giving people the illusion of waxy luster and feel. Pay special attention to identification.