Introduction of Emerald (Burmese Emerald)
A goods
Emerald without any chemical treatment.
The optimized jadeite also belongs to Class A and does not need to be proved in the certificate. The main optimization methods are:
Bleaching: It refers to soaking jadeite in dilute acid to "clean" the impurities on the surface of jadeite. The structural damage is only on the surface, and there is no filler (except waxing during polishing).
Wax invasion treatment: increase transparency, improve appearance and play a role in filling surface cracks.
Class b goods
Strong acid bleaching has seriously damaged the structure of jadeite, and a large number of polymers must be injected for reinforcement before it can be used. The certificate must indicate "treatment".
C goods
The primary color of jadeite is poor, and the bright color produced by dyeing treatment should also be marked "treatment".
B+C goods
After strong acidification, some jadeites are treated by adding a lot of polymers and colors.
Simple identification of jadeite A, B and C goods
Put the jade under the fluorescent lamp and observe its color change. Goods A and C are unchanged, and goods B are fluorescent white. C goods are dyed, so their colors are uneven along the cracks, which can be seen with the naked eye.
Evaluation of jadeite
colour
Color is the first factor to evaluate jadeite, and the criteria for good color are: positive, strong, clear and uniform.
Positive: refers to the range of hue, which depends on the ratio of primary color to secondary color, that is to say, it should be pure green and not mixed with other colors. For example, oil blue is often mixed with oil blue, and its value will be reduced.
Thick: refers to the depth of color. As far as emerald green is concerned, the concentration is preferably between 70% and 80%, and 90% is too strong.
Yang: It refers to the lightness of jade color. The lightness of jade is mainly determined by the ratio of green to black or gray. The more green, the brighter the color. The more black or gray, the darker the color. Experts often use an image method to express the bright sunshine of color. For example, boxwood green, parrot green, onion heart green and pepper green all refer to the color of fresh sun. Spinach green, oil green, river green and dark green refer to dull dark green.
The fresher the jadeite, the higher its natural value.
Average: refers to the uniformity of jade color distribution. The color distribution of jadeite is generally uneven, so it is not easy to get jadeite with uniform color distribution.
The best color: it should be pure green with a green concentration of 70%-80%, bright sunshine and uniform color distribution. This kind of high-grade jadeite habit is called the old pit species by experts.
transparency
Emerald is polycrystalline, mostly translucent or even opaque. It is impossible to be as transparent as a single crystal gem such as jade, so that light can pass freely and appear crystal clear.
structure
It refers to the thickness of crystal particles that make up jadeite, the shape of crystals and their combination. In jargon, this structure is called "bottom" and there is a name called "ground".
clean
Like other precious stones, the purity of jadeite is a major factor in evaluating its value. The defects of jadeite are mainly white and black. When evaluating jadeite, the value of jadeite is determined according to the degree of damage to the beauty of jadeite next time. For high-end goods, the next time will be a serious shortcoming, but for low-end goods, the impact will be much smaller.
Relatively speaking, black flowers are more influential than white flowers.
incision
The processing of jadeite products can be divided into bare products and carved products.
Bare products have high requirements for raw materials, and there can be no cracks, because cracks are easy to see. Jadeite with cracks is mostly used to make flower pieces, and cracks can be covered by carving.
Therefore, in the evaluation of nude products and flower pieces, under the same quality, nude products are more expensive than flower pieces except for particularly exquisite jade carvings.
crack
The existence of cracks is often fatal to jadeite finished products. With cracks, the value of jadeite will be greatly reduced, especially high-grade jadeite.
Generally, a flashlight can be used for perspective irradiation, and it is easy to see cracks.
Economic evaluation factors
1. Transparency: translucent is the best, but too transparent or opaque is not good.
2. Structure: The finer the particles, the better.
3. clarity: the best without flaws.
4. Cutting: the design of "cutting the jade without cutting the abrasive", finely crafted modeling, polishing and novel styles.
jade
Pronunciation: Cui Fei
Explanation:
1, bird name. Also known as kingfisher and red feather finch.
Source: Biography of the Southern Han Dynasty in Southwest China: "Peacocks, emeralds, rhinoceroses, elephants, orangutans and beasts are all born."
2. Refers to the feathers of bluebirds. There are blue, green, red and cyan, which are often used as decorations.
Source: The Biography of Hanshu Jia Shan: "Decorated with Zhuyu."
3. A green and transparent jade.