Precious metals mainly refer to eight metal elements such as gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium and platinum). Most of these metals have bright colors and strong chemical stability, so they are not easy to react with other chemicals under normal circumstances.
Precious metal jewelry includes all kinds of hair ornaments, earrings, neck ornaments, hand ornaments, foot ornaments, clothing and so on.
Other rare precious metals
Jinbao 1:
Gold is made into extremely thin gold foil and wrapped in materials based on copper, silver, zinc, nickel and so on. , and processed into various ornaments, cheap, giving people the same feeling as gold, often marked with 24KF, 18KF.
Step 2: Gold plating
Based on the principle of electrolysis, a layer of gold film is plated on the surface of metal substrate, and the thickness is generally greater than 10 micron. The metal substrate is mainly copper, silver, zinc, nickel or their alloys. The gold layer is very thin, easy to plate and has certain decorative effect, but the gold layer is easy to wear off, and the jewelry has only a short-lived glory, often 18KGP, 24K.