https://lillavilla.dk/blogs/tips-og-rad/hvorfor-kan-smykker-efterlade-gronne-maerker-pa-huden
Short answer: Green marks from jewelry are often related to copper in the jewelry or underneath a coating. Copper can react with sweat, moisture, and substances on the skin, forming compounds that can leave a greenish color on the skin. Coatings such as gold plating or silver plating can reduce direct contact at first, but the surface can wear down with use.
This guide mainly explains why it happens. If you already know the cause and want to go straight to practical advice, see how to reduce green marks from jewelry.
This guide is specifically about materials and plating. For a general explanation of the discoloration itself, read Why can silver rings leave a green mark on the skin?.
Copper base: the most common explanation
Copper is often used as a base in jewelry because the metal is malleable and well suited to many designs. When copper is exposed to substances including sweat, salt, moisture, and the skin's natural substances, colored copper compounds can form.
The Royal Society of Chemistry describes how copper can react with substances including sweat and form blue-green compounds that can settle on the skin. See the explanation from the Royal Society of Chemistry.
925 sterling silver: silver mixed with other metals
925 sterling silver consists of 92.5% silver and 7.5% other metals. Copper is often used in the alloy to make the silver more durable for jewelry.
That is why genuine sterling silver jewelry can sometimes also cause discoloration. A green mark is not, in itself, evidence that a piece of jewelry is fake or poor quality.
Gold plating and silver plating: the surface matters
Gold plating and silver plating sit as a layer on top of the base metal. As long as the surface is intact, there is less direct contact between the skin and the base metal.
However, coatings are surfaces that can wear down over time. Water, perfume, lotions, sweat, and friction can affect how quickly this happens. As more of the base metal is exposed, the risk of discoloration may increase.
What should you look for on the product page?
If you want to assess a piece of jewelry before buying, look for a clear material description. It is especially useful to know:
- the base metal, such as copper, brass, or sterling silver
- whether the jewelry is gold-plated or silver-plated
- the material of the earring posts or pin, if relevant
- the care instructions for the specific piece of jewelry
At Lilla Villa, we describe the base material and coating on the individual product pages, so you can more easily assess how the jewelry is made.
Green discoloration and skin irritation are not the same
A green mark may be a superficial discoloration that can be washed off. If your skin also becomes red, itchy, swollen, or sore, remove the jewelry. Skin irritation can have causes other than the green color itself.
How to minimize wear on the coating
- Remove jewelry before showering, exercising, and cleaning.
- Let lotion and perfume dry before putting on jewelry.
- Wipe jewelry with a soft, dry cloth after use.
- Store them in a dry place and preferably separately.
- Always follow the care instructions for the specific item.
Also read How to prevent jewelry from leaving green marks on your skin.
Quick material guide
Copper base
Can react with moisture, sweat, and skincare products, so it is particularly relevant when investigating the cause of green marks.
925 sterling silver
Consists mainly of silver but also contains other metals. Discoloration can therefore still occur.
Gold-plated or silver-plated
The coating covers the base metal, but can gradually be affected by water, chemicals, and friction.
See also our practical guides to jewelry and care or see all jewelry at Lilla Villa.
