Forecasting of properties of jeweller alloys on the basis of gold in system Au-Ag-Cu

Influence of the alloy composition on determining the millesimal fineness of gold by X-ray fluorescent and assay analysis

“…Determining the millesimal fineness of gold jewelry alloys in the member countries of the International Convention is carried out using the method of cupellation (assay analysis) for ISO 11426:2007, which is the most accurate and ruining [1,2]. The essence of the method lies in removal of non-precision alloying metals from the melted precious alloy by oxidation of lead at the temperature of 900 о С in the cupel (porous crucible), located in a muffle furnace.…”