Copper is the reason. Not cheap jewellery, and not your skin. Copper in the metal reacts with moisture, salt and the acids in your sweat, forming copper salts that are green. Those salts rub off onto your finger or your earlobe. It is the same reaction that turned the Statue of Liberty green, running very slowly on a much smaller scale.
It washes off. It is harmless. And it happens to good jewellery as well as bad, which is the part most people get wrong.
Why does jewellery turn your skin green?
Copper does not stay put. Exposed to water, oxygen and the chlorides in sweat, it forms compounds like copper chloride and copper carbonate. Those compounds are green, and they are soft enough to transfer straight onto skin.
Pure gold and silver are too soft to make jewellery from, so almost everything is alloyed with something harder. Copper is the usual choice. It is cheap, strong and it warms the colour of the metal. Good decision metallurgically. Also the reason your finger goes green.
Which metals turn your skin green?
Anything with copper in it, in rough order of how quickly it happens.
- Brass and bronze. Brass is copper and zinc, bronze is copper and tin. Both go green fast. Most inexpensive gold-tone jewellery is plated brass under the coating.
- Copper itself. Obviously, and quickly.
- Rose gold. Copper is what makes it rose. More copper means more colour and more chance of a mark.
- 9k gold. Only 37.5 per cent gold, so the rest is alloy, often with a good amount of copper in it.
- Sterling silver. 92.5 per cent silver, 7.5 per cent usually copper. It can mark, though it is slower than brass.
- 18k gold. 75 per cent gold, so far less alloy. It rarely marks anyone.
Metals that will not do it at all: platinum, titanium, palladium and surgical stainless steel. If green marks are a constant problem for you, those are the safe harbour. We explained what the karat numbers actually mean in what does 18k gold actually mean.
Does sterling silver turn your skin green?
Sometimes, and it is the copper in it doing the work, not the silver.
Seven and a half per cent is not much, so most people wear sterling for years without a mark. Warm weather, heavy sweat or a tight ring on a working hand can change that.
Worth separating two stains. Green is copper. A grey or black smudge is silver sulfide, ordinary tarnish reacting with sulphur in the air and on your skin. Different cause, same annoyance, both come off with soap.
Does gold vermeil turn your skin green?
Not while the gold layer is intact, because nothing containing copper is touching you.
Gold vermeil is a thick layer of real gold over sterling silver. The gold sits between your skin and the alloy underneath, so the reaction has nothing to work with. That is the whole practical argument for vermeil over plating.
The honest caveat is that vermeil is a layer, and layers wear. If the gold thins through at a contact point after years of hard wear, the sterling underneath is exposed and copper is back in the conversation. That takes a long time on a well-made piece and about a fortnight on plated brass. We laid out the difference in gold vermeil vs gold plated.
Why does it happen to some people and not others?
Sweat. Everyone's is slightly different, and the difference matters.
Sweat is mostly water, but it carries salt, urea and fatty acids, and how acidic yours runs varies from person to person and day to day. More acidic sweat strips copper faster. So does more sweat, which is why the same ring behaves in July and misbehaves in January.
What you put on your skin counts too. Hand cream, perfume, sunscreen and hairspray all sit in the gap between metal and skin. Chlorinated pools and the sea are the fastest routes to a mark, and hard on the metal itself, which we covered in can you wear gold vermeil in the shower.
Is green skin from jewellery harmful?
No. It is a surface stain and it washes off.
The copper salts sit on the skin rather than in it, and they fade within a day or two even if you do nothing.
A nickel reaction is a different thing entirely. That shows up as itching, redness or small blisters rather than a clean green stain, and it is an allergy rather than a discolouration. If your ears sting rather than stain, the metal is the question worth asking. We went through it in what earrings are best for sensitive ears.
Does a green mark mean the jewellery is fake?
No, and this is the myth worth killing.
Solid 9k gold is real gold, hallmarked and valuable, and it can leave a mark because of its copper content. Sterling silver can do the same. Meanwhile plated brass looks pristine for a few weeks before the coating gives way.
A green finger tells you there is copper close to your skin. It tells you nothing about whether the piece is genuine or what it cost.
How do you stop jewellery turning your skin green?
Keep copper away from your skin, and keep your skin dry underneath the metal.
- Buy solid or properly layered metal. 18k gold, gold vermeil over sterling, platinum or titanium. Plated brass is the usual culprit.
- Jewellery on last, off first. After moisturiser, perfume and sunscreen. Off before the pool, the beach, the shower and the gym.
- Dry your hands properly. Water trapped under a ring all day is the single biggest accelerator.
- Wipe pieces down after wearing. A soft dry cloth takes off the sweat and product film before it can react.
- Give rings a night off. Skin under a ring worn twenty-four hours a day never dries out.
You will see clear nail polish recommended for the inside of a band. It does work, for a week or two. Then it chips, and the flaked edges trap moisture against your skin, which is worse than where you started. Treat it as a fix for one evening, not a plan.
How do you get the green off your skin?
Warm water and ordinary soap. That is all it needs.
For a stubborn mark, rubbing alcohol on a cotton pad will lift it. Then clean the piece itself, because the residue in the metal is what stains you again tomorrow. Warm water, a drop of dish soap, a soft brush, rinse, dry, and leave it to air before it goes back in the box.
What we make
Every Good Goods piece is hand-painted enamel on 18k gold vermeil over sterling silver, hand-set with rose quartz or citrine, made in runs of twenty and never repeated. No brass anywhere in it.
Rings are where marks turn up first, because a band traps moisture against skin all day. That makes what sits under the gold matter most on your hands. The Icon Blush Enamel Band is 2.5mm, smooth inside, and $199.
Earlobes sweat far less than palms do, which is why earrings are the easiest place to wear colour without thinking about any of this. The Icon Seafoam Enamel Stud Earrings set a hand-set rose quartz in seafoam enamel at $299.
Frequently asked questions
Why does jewellery turn your finger green?
Copper in the metal reacts with moisture, salt and the acids in sweat to form copper salts, which are green and transfer onto skin. Brass, bronze, rose gold, 9k gold and sterling silver all contain copper. The stain is harmless and washes off with soap and water.
Does real gold turn your skin green?
It can. Lower karat gold like 9k is only 37.5 per cent gold, and the remaining alloy often contains copper. Higher karat gold such as 18k has far less alloy and rarely marks. A green finger says there is copper near your skin, not that the piece is fake.
Does gold vermeil turn your skin green?
Not while the gold layer is intact, because the gold sits between your skin and the sterling silver beneath it. If the layer eventually wears through at a contact point, the copper in the sterling can start to mark. Well-made vermeil takes years to reach that stage.
Why do only some people get green fingers from jewellery?
Sweat chemistry varies. More acidic sweat, and more of it, strips copper faster, which is why the same ring can be fine in cool weather and mark in summer. Hand cream, perfume, sunscreen and chlorine all speed up the reaction as well.
Is green skin from jewellery dangerous?
No. Copper salts sit on the surface of the skin and fade within a day or two on their own. Itching, redness or blistering is a different matter, usually a nickel allergy rather than copper staining.
How do you stop a ring turning your finger green?
Choose 18k gold, gold vermeil over sterling, platinum or titanium rather than plated brass. Put jewellery on after skincare and take it off before swimming or showering, dry your hands properly, wipe the piece down after wearing, and give the finger a night off.
Green is chemistry, not a verdict
A green mark is copper doing what copper does. It says nothing about whether you paid too little or your skin is unusual. Find out what is actually against your skin, and the question answers itself.
Wear the joy.