Nephrite is dominated by tremolite. White jade, サファイア, and blue-white jade can be distinguished by color. White jade can be called white jade. Its names include suet white, pear white, ivory white, 等, especially suet white with fine texture and moist luster. The sapphire is dark green and gray-green in color, uniform in color and fine in texture. The one between white jade and sapphire is green white jade.
According to color characteristics, there are some traditional names. 例えば, “Topaz”: light yellow to beeswax yellow, yellow with green flashing, much lighter color, rare thick ones, very precious when the color is thick, high-quality ones are not inferior to mutton fat white jade; “碧玉”: dark green, dark green Or dark green, pure color is better. Mo jade is black in different shades, black and white, and black and white colors can be used for pretty color works; “sugar jade”: like sugar red, sugar often has a gradual transition relationship with white jade or blue and white jade, blood red is the best color .
Nephrite jade can be evaluated from several aspects such as color, テクスチャ, 透明性, gloss, clarity and weight.
色: Color is very important for the quality evaluation of nephrite. 一般的に, the color is required to be uniform and bright, without variegation. The tone of nephrite is very rich, white is the best tone, the value is the highest, and other tones are relatively poor. Different colors have different requirements for their density. For green, medium-darkness is the best, too dark or too light is not good; for white, the whiter the better; for black, the darker the better. 一般的に, the purer the color, より良い, and the brighter the better.
Texture: The texture is fine, 純粋な, and flawless. It is required to moisturize the jewelry after polishing.
光沢: The luster of nephrite jade ranges from waxy luster to grease luster. The stronger the grease luster, より良い. Suet jade is the highest quality nephrite jade because of its strong luster and oiliness.
Different shades of nephrite have different requirements for transparency. For yellow and green ones, 透明性が高いほど, より良い, while the white ones are slightly transparent.
明確さ: The clarity of nephrite depends on the amount of impurities and blemishes. Compared with other jade types, the fissures of nephrite jade are not developed and relatively few. The larger the cracks, the more the quality is, the worse the quality will be. Digging out the dirt when making carvings.
重さ: For other nephrite jade of the same quality, it is obvious that the larger the size, つまり, the greater the weight, the higher the value.
In addition to color and shape, nephrite has two major advantages. One is that it is inert to cold and heat, and it is worn close to the body. It is not cold in winter and not hot in summer; the other is that it is not corroded by acid and alkali, so it can be buried in the ground for thousands of years.
Nephrite is widely distributed, with nephrite produced in Hotan County in Xinjiang being the best, and nephrite produced in Qinghai is also produced. Xinjiang is famous all over the world as the hometown of nephrite jade in China, と “Hetian jade” as its famous variety. Canada, New Zealand, ロシア, the United States and other places also have output.