Stainless steel jewelry manufacturer tells you about allergic reactions to jewelry

Jewelry manufacturers tell you about the different materials of jewelry
Copper jewelry: After copper reaction, the skin will appear green. The jewelry we wear may not be made of pure copper, but the copper content in it is sufficient to react with the skin. Especially when the body chemistry is strong, it is more likely to produce spots.
Pure silver jewelry: Pure silver contains 7.5% copper, but most of the spots caused by pure silver jewelry are black and occur after the metal reacts with air to turn black. Some pure silver jewelry is coated to prevent air oxidation, but the coating will gradually peel off over time of wearing.
Gold jewelry: Gold itself hardly leaves any stains on your skin, but other metals mixed in with gold can. Copper, nickel, silver, and gold are mixed to change the color tone of gold and make it harder, reducing its cost. Any of these metals will leave their marks on your skin. The smaller the K (Karat) on gold jewelry, the lower the purity of gold and the higher the content of other metals. Some people wear 10K gold without any reaction, but some people must purchase 18K gold to prevent discoloration.
Nickel containing jewelry: If you are allergic to nickel, it will leave you with more than just stains. Wearing nickel containing jewelry will make your skin itch, swell, and even yellow water flow out.
Jewelry manufacturers tell you how to avoid allergies
Wear high-purity metal jewelry, such as 18K gold. Try to choose platinum jewelry as much as possible, which is expensive but rarely reacts with the skin and generally does not cause allergies; Apply a layer of transparent nail polish where the jewelry touches the skin; Jewelry manufacturers advise you to choose stainless steel jewelry if possible; Titanium jewelry is not easily reactive with the skin and does not cause metal allergies; Purchase jewelry labeled as “hypoallergenic” specifically designed for people with sensitive skin; Keep your skin dry when wearing jewelry; Keep jewelry clean and avoid rusting.