C-grade dyed jadeite impersonates old pit glass-grade jadeite. Experts teach you 3 ways to judge the authenticity and avoid being fooled

Choosing jade is a big deal. Dong Ge has explained to you how to choose jade before, but that is only one aspect. If you want to choose high-quality jade that suits you, you also need to evaluate the jade from multiple aspects, such as whether there is a certificate issued by a formal appraisal agency, what its texture, hardness, and jade quality are, etc.

Jadeite Evaluation

Jade Certificate

The CMA, CAL, CNAS/CNAL logos on the jade certificate mean that the jade has been certified by a national agency and its authenticity is guaranteed. If you spend a lot of money in a jewelry store but don't get the relevant certificate, it is worth considering whether the jade is genuine.

Fluorescent lamp identification

Jade will produce different colors under fluorescent light because it has been artificially processed by acid washing, bleaching, glue injection and dyeing, which produces a fluorescent effect. The color of A and C goods does not change, but B goods fluoresce and appear whitish. Although C goods have no fluorescent effect after dyeing, the color is distributed along the cracks, and the distribution is uneven and visible to the naked eye.

The first factor to judge jadeite

The raw jadeite is mined from the mine, and the first thing you see after opening the window is the color of the jadeite. Therefore, it is not an exaggeration to say that the color of jade is the first factor in evaluation. There are four standards for color: rich, positive, positive, and harmonious.

Thick: refers to the depth of jade color, but the thicker the better. Too thick jade will reduce transparency. For the best jade green, the concentration is between 70% and 80%. 90% is too thick. Although the color is good, the spirituality will be insufficient.

Yang: refers to the brightness of jadeite's color. To put it simply, it is the proportion of other colors mixed in the color. Usually the content of black and gray is the standard for determining jadeite's brightness. Green is more likely to be bright, while black or gray is more likely to be dark. Experts have corresponding terms to describe the brightness of jadeite: boxwood green, parrot green, onion green, chili green, all refer to bright colors. Spinach green, oil green, river green, and black green refer to dull dark green colors.

Positive: refers to the range of color tones. Jade will contain a certain amount of impurities, which will cause the secondary color and the primary color to compete for power, and the value of this kind of jade will be very low. Pure green, such as imperial green and pure emerald green, are very valuable. Because the Youqing variety has some blue color, its value is naturally not as high as the Imperial Green variety.

And: refers to the uniformity of color distribution of jadeite. Due to the different textures of jade, the presence of white cotton will cause uneven color distribution. For jade with uniform color distribution, white cotton basically does not exist, so it is normal for the high price.

The green concentration of high-end old pit glass-type jadeite is between 70% and 80%, the color is bright, and the distribution is even, and it is rare in the world.

Quality identification

Texture: Natural jade is transparent or translucent, with an oily and shiny surface and fibrous substances visible to the naked eye.

Hardness: Natural jade is jadeite, with a Mohs hardness of 7. The hardness is often judged by scratching glass against each other. Fake jade has low hardness and will be scratched.

Jadeite quality: When observing natural jadeite under strong light, due to its texture, other mineral particles will have emerald flashes under the strong light, which is called jadeite flower or jadeite quality.

Relative density (specific gravity): Natural jade has a hard and tight structure and high density. Because there are no bubbles, it makes a crisp sound when knocked. Fake jade has a loose structure and low density, and the bubbles cause the sound to be hoarse and not crisp when knocked.

Color: The authentic emerald green is rich, bright and pure. The green lines on fake jade are messy and tiny, or even invisible, and it is turbid and has no luster.

How to identify fake dyed jadeite

Melt a pot of wax and place the dyed jade in it; the dye pigment will precipitate out. The genuine product will not be damaged, which is also a common means of judgment.

Charles filter, dyed jadeite appears purple-red under the Charles filter, while the color of natural jadeite remains unchanged.

The Malaysian jade among dyed jadeite is pure green and transparent as old pit glass. When looking at it through a magnifying glass under strong light, you can see a fishing net pattern inside. The fishing net wire is green and the mesh is white. The green color inside the natural jade is irregular and of various shapes.

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