There are many kinds of jades in China with a long history.
According to the origin, the famous ones are Nanguo Jade produced in Xinyi, Guangdong, Henan Jade produced in Henan, Shandong Jade produced in Shandong, and Sheep Fat Jade produced in Yili and Hotan, Xinjiang.
Most of the more expensive jadeite ornaments in domestic jadeite are made of these jadeites.
Emerald jade is the best in the international jewelry industry.
① The hue of jadeite can be roughly divided into the following six types:
1, white, basically contains no other impurity elements.
2, red, containing chemical element iron.
3, green, containing more than 2% chromium.
4, black, containing more than 2% chromium and iron.
5, yellow, containing tantalum.
6, purple, containing ferrochrome and cobalt.
As can be seen from the above, jadeite contains elements needed by human body, and different jadeite colors contain different elements. Therefore, the real jade is very beneficial to the human body, so be very cautious when choosing to buy jade products.
(2) The jadeites popular in the market at present are divided into the following four categories according to the grade of authenticity:
Grade A goods are not only natural in texture, but also natural in color. Identification methods mainly focus on the following three points.
(1) Look before you leap. Because of the relationship between mineral resources and exploitation and the specific situation of people's large demand. At present, there are few good jadeite jade on the market. In particular, there are few varieties with green color and bright ground color.
(2) Generally, varieties such as Mabel Miao, spinach green, scarlet or violet floating flowers are common.
(3) Observed by naked eyes under the light, the texture is delicate, the color is soft and the stone lines are obvious; Slight impact, crisp and pleasant voice; Holding it in your hand has a heavy feeling, which is obviously different from other parts of the stone.
For grade B jadeite, commonly known as "dirty" jadeite with black spots, it is immersed in strong acid for corrosion to remove "dirty" and "cotton" to increase transparency, and then epoxy resin or substitute filler is injected into the microcracks caused by strong acid corrosion with high pressure to fill and consolidate the cracks.
(1) The color of B goods was good at first. If you look closely, the color will become evil. If you look at it under a lamp, the color transparency will be weakened.
(2) Within two years, B goods gradually lost their luster, were full of cracks and became ugly. This is caused by the strong acid destroying its original quality.
(3) The density is reduced and the weight is reduced. Slight impact, low voice, lost the crisp sound of a cargo.
Class c goods, completely artificially colored. ?
(1) At first glance, the color is not right and evil.
(2) Looking closely under the lamp, the color does not naturally exist in jadeite crystals, but is filled in the cracks of minerals, showing a network distribution of colorless roots.
(3) Observing with Charles filter, the green color becomes red or colorless.
(4) The surface color can be removed by scrubbing with powerful decoloring agent or turned brown.
D goods, D goods pretending to be jade ornaments mainly have the following two categories.
(1) jade. That is, other jadeites pretend to be jadeites. There are mainly Thai jadeite and Malaysian jadeite, Nanyang dushan jade, Qinghai jadeite, Miyu, Australian jadeite and Dongling stone. The difference between jadeite and jadeite is: first, the hardness is low; Second, low density (light weight) and weak luster.
(2) Green glass and green plastic. Most of these substitutes are dull and ugly, and their luster is very weak. The relative density is very light, the hardness is low (it can be carved with nails), and there is no cold feeling.