This Standard specifies the method principle, test method and result representation of cathode luminescence image method for gems testing. This Standard applies

This Standard specifies the requirements of the tactile warnings of danger on package of dangerous substances or preparations with mandatory provisions. To avoi

This Standard specifies the requirements, measurement method and marking for the mass measurement permissible errors of jewelry and precious metal products. Thi

This Standard specifies the principles, reagents and materials, instruments and equipment, sampling and preparation of specimens, preparation work, test procedu

This Standard specifies the classification and type, requirements, test methods, inspection rules, packaging, product marking, transport, and storage, etc. of t