Short answer: Green marks from jewelry are often related to copper in the jewelry or beneath 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 primarily explains why it happens. If you already know the cause and want to go directly to practical advice, see how to reduce green marks from jewelry.
This guide focuses specifically on materials and coatings. If you want the general explanation of the discoloration itself, read Why can silver rings leave a green color 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 sweat, salt, moisture, and the skin’s natural substances, among other things, colored copper compounds can form.
The Royal Society of Chemistry describes how copper can react with sweat, among other substances, and form blue-green compounds that can transfer to 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.
Therefore, genuine sterling silver jewelry can in some cases also cause discoloration. A green mark is not in itself evidence that a piece of jewelry is fake or of poor quality.
Gold plating and silver plating: the surface matters
Gold plating and silver plating form a layer over the base metal. As long as the surface remains intact, contact between the skin and the base metal is less direct.
However, coatings are surfaces that can wear down over time. Water, perfume, creams, sweat, and friction can affect how quickly this happens. As more of the base metal becomes 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 description of the materials. 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 used for posts or pins, 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, making it easier for you to assess how the jewelry is constructed.
Green discoloration and skin irritation are not the same
A green mark may be a superficial discoloration that can be washed off. If the skin also becomes red, itchy, swollen, or sore, you should remove the jewelry. Skin irritation can have causes other than the green color itself.
How to reduce the impact on the coating
- Remove jewelry before showering, exercising, and cleaning.
- Let cream and perfume dry before putting on jewelry.
- Wipe jewelry with a soft, dry cloth after use.
- Store it in a dry place, preferably separately.
- Always follow the care instructions for the specific item.
Also read How to prevent jewelry from leaving green marks on the skin.
Quick material guide
Copper base
Can react with moisture, sweat, and skin products and is therefore particularly relevant when investigating the cause of green marks.
925 sterling silver
Consists primarily 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.
Also see our practical guides to jewelry and care or see all jewelry at Lilla Villa.
