Characteristics of Iridium-Doped Gold Jewelry and Its Determination

The superficial characteristics of iridium-doped gold jewelry and the occurrence and the chemical compositions of doped material in gold jewelry have been investigated by using optical microscopy and X-ray fluorescence spectrum analysis.The results show that the doped materials are iridium,ruthenium,osmium,etc,which occur in independent phase.The proportion ofw(Ir+Os)∶w(Ru) is 65%~70%∶30%~35%.The densities of the doped materials are consistent with that of gold.The doping materials in gold jewelry result in the insufficient purity.The testing metheds of iridium-doped jewelry are probed.