The classification of jewelry and jade is made by scientific and reasonable methods on the basis of revealing its inherent natural attributes, physical and chemical characteristics and evolution law. Since 19 16, Japanese gemologists have proposed to classify gems. For many years, people have made some general classification according to the application field, commodity value, gem grade, mineral and rock geological characteristics. Although many schemes have been put forward for the classification of gems at home and abroad, so far, there is no globally recognized classification scheme.

China People's Standard GB/T 1 65438-2003, which came into effect on June 65438+1October/0, stipulated the gem classification method currently used in China according to the genetic types of gems, and this classification was adopted in this textbook.

Gem identification