When buying jade jewelry in a jewelry store, I often hear some experts say that this jade is older, higher in color, and more watery. The jade is not enough vintage, tender, light, and dry.
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In their view, the jade is the older the better. When it comes to the year of jade, the first thing to do is to understand the concept of old and new in this time. This old and new refers to the formation of jade under the ground, which is what geologists mean. What about the age? Or do people refer to the succession of jade? Or is the year in which people bought the finished product for storage?
The old pit and the new pit are actually divided according to the years that people discovered and extracted jade. According to the geological point of view, the geological times they formed in the underground are the same. The secondary deposits of river sediments are formed by the rivers transported to the riverbed during the Quaternary period. It can be said that the deposits formed later are later.
Some experts have discovered from long-term practice that the quality of the jade in the "old pit" is good and the water is also sufficient. This is a fact. Is it because water is soaked in the river for a long time, and the water is formed into the crystal? In fact, this is not the case. The jade found in the river sediment deposits is of good quality, high in color, fine in quality and good in transparency. For this situation, a reasonable explanation can be obtained from the geological reason.
In fact, these phenomena exist in the jade trampoline, and other gem deposits also exist. For example, the diamond in the sand mine is better than the original deposit.
This is because the primary deposits actually have various ore of different quality. After the flow of water, they are deposited into secondary deposits, some of which are of poor quality, such as cracked, coarse-grained, loosely structured, impure jade. Will get natural sorting and elimination. The last remaining in the riverbed is mainly jadeite with relatively tight texture and finer structure. This kind of jadeite is often more transparent, but it is not caused by water entering people. Water can't enter the jade crystal. The jade quality of the old pit is better because of this relationship.
This layer of skin on the outer surface of the jadeite is due to the fact that when the jadeite is exposed to the surface, it is oxidized and hydrolyzed by nature to cause some iron and manganese contained in it to precipitate as iron oxide or manganese oxide attached to the surface to form a The layer shell, like the knife that is not commonly used, has the same surface as oxide rust.
It can be said that the quality of the jade in the "old pit" is good, but there are also jadeites with better quality in the new pit, but only relatively few. This is the result of no sorting.
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