Aberdeen jade: It is formed from the original nephrite mineral deposits transported by weathering to the river. 一般的に, it is pebble-like, with smooth surface, good roundness, and a layer of skin on the outside, with small blockiness.
Mountain jade: A primary ore produced on the mountain, it is characterized by sharp edges and corners, rough texture, large block, and often inferior to the quality.
Mountain and flowing water: It is between aberdeen jade and mountain jade. It has a larger lumpiness than aberdeen jade, slightly rounded, and has a smoother surface. The quality is slightly better than that of mountain jade, second only to aberdeen jade.
2. Divided by color
White jade: The color is white, may be slightly gray, and the texture is fine. The high-quality one is “mutton jade”, which is very rare.
サファイア: Nephrite with gray-green hue, the most common.
Cyan white jade: The color is between white jade and sapphire.
Jasper: Green-dark green.
Topaz: Yellow-beige, the best one is yellow like Yanli, very rare.
Sugar jade: The color is similar to brown sugar, mainly brown, brown, 赤, 等.
Moyu: Also called black jade. Refers to the nephrite jade whose color is pure black, jet black, and dark gray, with pure black being the best.
Flower jade: refers to a piece of jade that has multiple colors, is properly distributed, and constitutes a certain shape and pattern, such as “tiger skin jade” そして “variegated jade”.
The basic quality evaluation of nephrite jade has a recognized dimension in China. 現在のところ, the technical requirements and economic evaluation basis of nephrite raw materials in China’s arts and crafts circles and jewelry industry can be summarized as: three good plus one degree, つまり, good texture, good color, and good gloss. And there is a certain degree of blockiness.
Good texture: Nephrite raw materials are required to be tough, fine and flawless.
Good color: It is required to be bright in color, pure and free of noise.
Good gloss: It is required to achieve bright gloss and no porcelain (つまり, the gloss phenomenon of porcelain).
Lumpiness: It requires a certain quality.
The cleaning and maintenance of nephrite is relatively simple: Nephrite can be cleaned with a mild neutral solvent and stored separately to prevent collision, ほこり, and corrosion.