GB/T 18781-2002 in English

《GB/T 18781-2002养殖珍珠分级》由TC256（全国首饰标准化技术委员会）归口，主管部门为中国轻工业联合会。
本标准规定了养殖珍珠的定义、分类、质量因素及其级别、等级指标、检验方法和标识的要求。本标准适用于养殖珍珠的生产、贸易、质量评估等活动，不适用于经辐照、染色等处理的养殖珍珠的分级。对于天然珍珠的分级也可参照执行。

Scope

This standard specifies the definition, classification, quality factors and grades, grade indicators, inspection methods and labeling requirements of cultured pearls. This standard applies to activities such as production, trade, and quality evaluation of cultured pearls, but not to the grading of cultured pearls that have been irradiated or dyed. The grading of natural pearls can also be implemented by reference.