岫玉的质量评价（Evaluation of the quality of the jade）.docVIP

岫玉的质量评价（Evaluation of the quality of the jade） Evaluation of the quality of the jade Jade is one of Chinas four famous jade, with long history of development and utilization, produced in Liaoning Xiuyan County, mainly by the serpentine, usually green, good transparency, hardness of 4.9-5.5 density is 2.5 2.7g / cm2, glass luster or oily luster, its production accounts for about 70% of the total output of the jade stone, in in 2000 the national stone candidate topped under selection. Evaluation of the quality of the jade is mainly based on the following 8 basic elements and standards. 1. colors The jade of the variety of colors, shades, color and depth according to the class can be roughly divided as follows. Dark green, green, green series: green, green, green. Yellow series: orange, lemon, yellow, yellow, yellow. Black Series: ink, black and blue, gray, dark gray, light gray. White series: milky white, soft, colorless. Mixed color series: dark green, green yellow, yellow green, yellow white, yellow white, gray. Flower jade series: red texture, brown texture, orange texture, yellow texture. In a range of colors, the green series is best, followed by yellow. In the specific evaluation of good and bad color, four aspects should be observed and analyzed, that is, concentration, purity, brightness and uniformity. Concentration refers to the depth of color, generally speaking, the medium concentration is best, too deep or too shallow, poor. Purity refers to the purity of the tone, when mixed with other colors, it is not pure, or called partial color, obviously, the more pure tone the better, mixed color is poor. Brilliance refers to the brightness of color, also known as color Yang, of course, the brighter the higher the better. Uniformity refers to the degree of uniform distribution of the color in general, color is more uniform as possible, uneven, but for some varieties of jade or jade, flower, red, brown, orange, all yellow and be the most changeful patterns, often c