CBPL methods do not include proprietary information such as ASTM Standards.
Natural or cultured pearls, precious or semi-precious stones, precious metals, metals clad with precious metal and articles thereof; imitation jewelry; coin
Gold: Quantitative Analysis by Fire Assay
Test Methods for Chemical Analysis of Silver Brazing Alloys (ASTM E 56)
Test Methods for Chemical Analysis of Lead and Tin-Base Solder (ASTM E 46)
Gold Fineness in Articles of Jewelry