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Why are the colors of jade bracelets getting lighter and lighter?
Human sweat contains 99% water, 65,438+0% solids, mainly sodium chloride, and a small amount of potassium chloride and urea. According to different constitutions, the PH value is between 4.2 and 7.5. These components can penetrate into the interior from the capillary cracks of jade, and slowly react with chromium ions or dissolve the chromium ions that have been consolidated in jade to migrate, which makes the color of jade locally lighter.

In addition to sweating, skin glands also secrete oil, which penetrates into the micro-cracks of jadeite, making jadeite look more transparent, and the colorless part of jadeite also reflects green through internal reflection.

Due to the different content of chromium, the color of jadeite is white or green. Generally speaking, white and green varieties are the most common, and emerald is the most expensive. Other colors are white, red, black, green, yellow, purple and so on.

According to different colors, green jadeite can be further divided into emerald green, emerald green, seedling green, emerald green, bean green, spinach green, shallow water green and so on. The colors of jadeite are positive (pure), positive (bright), strong (thick) and even (even). Royal green, emerald green, seedling green and emerald green are top grades, and royal green is the most precious of the four.

Emerald belongs to pyroxene, the chemical name is sodium aluminosilicate, monoclinic system, perfect cleavage. The main component is sodium aluminum silicate (English: sodium aluminum silicate), which is produced in metamorphic rocks generated at low temperature and high pressure. It often coexists with glaucophane, muscovite, andalusite (anorthite dihydrate), aragonite and Yingshi. Mohs hardness is 6.5-7, specific gravity is 3.25-3.35, and melting point is 900- 1000? Between c?

Extended data:

Emerald classification

1, A goods: The A goods of jadeite refer to jadeite that is naturally produced, and only processed, carved, polished and polished by physical methods, without using any chemical or irradiation methods to improve its internal structure.

2. New Class A goods (belonging to Class B goods): It refers to adding color to the color root on the basis of Class A jadeite. It is particularly important to note that this jadeite colored product has no fluorescence reaction and does not change its specific gravity. "Emerald A Certificate" will be issued by lax appraisal agency. This kind of jadeite is sold in the jewelry market and even in many famous shops. If you buy jade with collectible value, remember to be cautious.

3. Goods B: pickling, bleaching and glue injection.

4. Goods C: Dyeing treatment. Used for jadeite dyeing. Whether it is acid leaching bleaching or filling with glue, artificially colored jadeite is called C goods.

Baidu encyclopedia-emerald