To talk about and the nephrite classification , China jewelry

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has a history of 7000 years of development and utilization of the world-renowned and nephrite, since ancient times, has many classification. These classification due to different methods, or With one and nephrite crafts or piece of jade, also have their own say, the problem now feel more and more prominent, to scientific research and nephrite, processing, mining, education, commerce, identification bring a lot of inconvenience and trouble.

perfect on and nephrite classification in China such as the Song Zhang Shinan wrote , Mount Wutai, Yutian country. The fifth of five colors: white, such as cut-off fat, such as steamed chestnut yellow, black as some paint, red cockscomb, or darker, such as rouge color. Another Bik merged, compete with the most common is this jade. Fu Heng redact This shows that the ancient knowledge and nephrite very profound, very carefully, classification, roughly today and nephrite classification, just because of the technical conditions of the past, classification is not so comprehensive it today.

because of the urgent needs of the market situation, and nephrite must have a unified classification criteria, the Gemmological Association of Xinjiang specialized in organizing a number of seminars and nephrite classification, and as a research projects of the Association included work plan. Necessary to formulate a, and Tian Yuwen word classification criteria, and must meet the physical specimens of control, in order to facilitate reference to the classification unified understanding and nephrite. access to a large number of ancient and nephrite classification of information, research, after many discussions and our understanding of practice and of nephrite work years, initially proposed should be based on color, texture and nephrite Sort , gloss, transparency, lock, crack, impurities based. According to the above-mentioned conditions and requirements, collected and nephrite is divided into six categories of nineteen. Six categories: white, green jade, jade, jasper, black jade, topaz.