Why Does My Ring Turn My Finger Green?

A green mark under a ring is not an allergic reaction, and it does not mean the ring is dirty. It is a chemical reaction, and it tells you something specific about what the ring is made of.

The chemistry, briefly

Copper reacts with acids and moisture on your skin, including sweat, lotions and soap residue. The reaction forms copper salts, which are green. Those salts transfer to your skin.

Copper is in almost all jewelry metal, because pure gold is too soft to wear. The question is how much.

• Plated jewelry has a brass or copper core under a thin gold coating. Once that coating wears through, the core is directly against your skin, and the green appears fast.

• 10K gold contains the most copper of the solid golds. Green marks are possible but far less common.

• 14K and 18K contain progressively less. Marks are rare.

• Rose gold of any karat contains extra copper deliberately, since copper is what makes it pink.

So the pattern most people experience — cheap rings mark, better rings do not — is a straightforward copper-content story.

What makes it worse

• Hand lotion, sunscreen and soap trapped under the band

• Sweat, heat and humidity

• Swimming pools, since chlorine attacks alloy metals

• Acidic skin, which varies naturally between people and even with diet and medication

How to stop it

• Move up in karat. 14K or 18K has less copper to react.

• Replace plated rings rather than re-plating them. Re-plating buys another year at best.

• Take rings off before applying lotion, washing up, swimming or exercising.

• Clean the ring properly with warm water, mild soap and a soft brush, then dry it completely.

• Dry your hands thoroughly after washing. Moisture trapped under a band is the main trigger.

The green itself is harmless and washes off. It is your jewelry's way of telling you what it is made of.

Frequently asked questions

Does real gold turn your finger green?

Solid gold rarely does, and higher karats almost never. Pure gold does not react at all; the copper in the alloy does.

Is the green mark dangerous?

No. It is a surface stain that washes off with soap and water. If the skin is itchy, sore or blistered, that is a nickel reaction rather than copper, which is a different problem.

Why does it only happen sometimes?

Skin acidity changes with diet, medication, hormones, heat and humidity. The same ring can mark in summer and not in winter.

Will clear nail polish fix it?

Temporarily. It wears off within days and has to be reapplied, so it is a patch, not a fix.

Everything we sell is solid gold in 10K, 14K and 18K, never plated. Browse rings and necklaces, or read about gold for sensitive skin.