The third edition of the BiH standard BAS EN ISO 11426: 2021, Jewellery and precious metals - Determination of gold - Cupellation method (fire assay) was adopted by the translation method through the Technical Committee BAS/TC 38, Metrology and measurement.

The original text of the European standard was prepared by the Technical Committee ISO/TC 174, "Jewellery and precious metals" in cooperation with the Technical Committee CEN/SS M21, "Precious metals - Applications in jewellery and associated products", the secretariat of which is held by CEN-CENELEC Management Center (CCMC).

This standard specifies a cupellation method for the determination of gold on a material considered homogeneous. The gold content of the sample lies preferably between 100 and 999.5 parts per thousand (‰) by weight. Fineness above 999.5 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093). This procedure is applicable to most types of gold samples. Some modifications are indicated for specific cases (presence of large amounts of base metals, platinum or palladium, silver). It is not compatible with the presence above trace levels of iridium, rhodium and ruthenium (more than 0.25 ‰ for the sum of all three elements). This method is also intended to be used as the recommended method for the determination of fineness in jewellry alloys covered by ISO 9202.