Some friends will ask whether 18K gold jewelry will fade. The answer is here

Some friends will ask whether 18K gold jewelry will fade. The answer here is that 18K gold itself will not change color. There is a layer of plating on the surface of the jewelry. Some behaviors in life cause the plating to fall off and show the original color of 18K gold jewelry. 18K gold refers to a gold alloy with a purity of 75%, and its color is yellow. Of course, some 18K gold jewelry can be made into rose gold (yellow and slightly reddish) by changing the formula of another 25% alloy (such as adding a high proportion of copper). Rhodium itself is also a rare metal, belonging to the platinum group in the periodic table of elements, which is the same group of elements as our common platinum metal. It has stable chemical properties and strong corrosion resistance, making it a good coating material. The price is even higher than platinum (in terms of international precious metal prices, rhodium is almost twice as high as platinum). Although the nature of rhodium itself is very stable, as the plating layer of 18K gold jewelry, the thickness is relatively thin, it will still be worn away, and then the original yellow of 18K gold will gradually be exposed. As a jewellery worn daily, the inner part of the ring's palm will change significantly in about 2 years. If: 18K gold jewelry after discoloration, only need to polish the surface plating part, and then re-electroplating, it will be intact as before, almost no gold loss. The cost of gold plating is very low. Although rhodium itself is very expensive, only a small amount of rhodium is required for the plating. Usually, the cost of plating during processing is only a few dozen dollars. Taken together, the discoloration of the 18K gold coating can be solved at a very small cost. If compared with platinum due to its soft texture: easy to deform, easy to grind, and wear and tear caused by re-polishing after grinding, the maintenance cost of 18K gold is lower and easier. In addition, 18K gold itself has high hardness and is not easy to deform and cause diamonds to fall off, which can improve higher security.