玉石鉴定(国外英文资料).doc

玉石鉴定(国外英文资料) Identification of jade grade and quality, mainly in the following standards: 1. color is the most important index to evaluate the jade, regardless of color, are jade uniform, bright color, no pent up feeling, no other color for the best. Is jadeite, green best, followed by red and purple. Dark in color, jade is yellowish is inferior. 2., the thinner the texture, the higher the transparency (jargon says transparency is water), the better the quality. Fine jade should be crystal clear, can not see spots, without hair, not astringent. 3. knock with a metal stick percussion jade listening to the sounds of voicing, it can distinguish jade texture, jade is two can determine whether there are cracks and not easy to find a cut. The more crisp the sound is. 4. good jade should be visible to the naked eye obvious flaws, against the bright light shine can be distinguished. The shape of the 5. shape jade can not be measured by a unified standard, but it can be evaluated from two aspects of the art of modeling and the technical level of processing (cutting, polishing, polishing). The head of jade actually refers to the degree of jade moistening, to a certain extent, the transparency of jade. The texture and color of jadeite jade mainly depends on the head, in fact sometimes between these three factors influence each other, so the jewelry industry and the integration of these three factors become the kind concept, will be divided into different kinds of jade, such as glass refers to run fine texture and good transparency jade, if coupled with the color green, the so-called green glass, jade is the best; and cyanine of jadeite is refers to some with green, gray and texture, local color distribution often showed patchy jade etc.. In general, the delicate texture of jade transparency is good, but the actual head, there are exceptions, such as ice or some jade lotus jade, the particle is not too fine, sometimes under the naked eye is very obvious, even particles can reac