Zijin is not pure gold, so some metal elements will react with oxygen and sweat, and the most common one is oxidation. For example, iron oxide, commonly known as "rust", will appear in the oxidation reaction of iron, so it will change color.

Zijin is the national gold of Russia. Zijin is a synthetic metal material, mainly composed of gold and copper. It is a kind of colored gold, similar to rose gold, but its gold content is lower than rose gold. Zijin is essentially an alloy.

Russia has a vast territory and rich resources, and the Zijin products industry is very rich. Russian Zijin is the most famous in the world. Russian Zijin is named after its purple appearance, high hardness, high wear resistance, strong oxidation resistance and high fire resistance.

Extended data

Due to different producing areas, the fineness of Zijin is also different. Because Zijin's craftsmanship is exquisite, even the same brand of Zijin jewelry will have different colors and brightness because of different craftsmanship.

However, the brightness, glossiness, hardness and wear resistance of Zijin jewelry still maintain its original glossiness and brightness even after being worn for many years. Pure purple and gold jewelry are marked as Au585, and the rest are Au375.

Among the gold ornaments, Zijin is the most Russian style. High hardness and bright color. Among them, finished products, such as rings, earrings, bracelets, etc. In the social activities of Europe's top society, it is a symbol of dignity, wealth and high taste. And it will get brighter and brighter with the wearing time, so there is no need to go to a professional gold shop for cleaning.

Reference source: Baidu Encyclopedia-Zijin