Why Jewelry Turns Your Skin Green (And Which Metals Never Do)
Jewelry turns your skin green because metals in the piece - primarily copper - react with your skin's moisture and pH to form copper salts (copper chloride or copper carbonate). These salts are greenish and transfer directly to skin on contact. The stain is harmless and washes off, but it is a signal that you're wearing a reactive metal.
Which metals cause green skin?
The culprit is almost always copper. Many affordable jewelry metals are copper-heavy:
- Brass - typically 70% copper, 30% zinc. Reacts quickly with sweat.
- Bronze - copper-tin alloy, same problem.
- Gold-plated over a brass or copper base - once the thin plating wears through, the base metal reacts with skin.
- Sterling silver (925) - contains 7.5% copper; may leave light marks in hot or sweaty conditions.
Which metals never turn skin green?
| Metal | Turns skin green? | Notes |
|---|---|---|
| 316L stainless steel | No | Medical-grade, corrosion-resistant, no copper content |
| Titanium | No | Inert, biocompatible |
| Platinum | No | No reactive metals |
| Solid gold (14k+) | No | 14k and higher does not tarnish on skin |
| Niobium | No | Safe for most sensitivities |
| Brass (no plating) | Yes | Reacts fast with sweat |
| Gold-plated brass | Yes, once plating wears | Plating is a temporary barrier, not a permanent fix |
Why does PVD-coated stainless steel not cause green skin?
ORNALIO uses 316L stainless steel as its base metal, with 18k gold PVD coating bonded to the surface. 316L contains no copper and resists corrosion even in salt water. The PVD coating adds a protective layer, but even if surface wear occurs, the steel underneath does not react with skin the way copper-based metals do.
Is the green stain dangerous?
No - copper-salt green stains are not toxic. They wash off with soap and water. But they are a clear sign the metal is corroding against your skin. If you see consistent green marks, the piece is not suitable for everyday or active wear.
How to avoid green skin from jewelry
- Choose 316L stainless steel, titanium, or solid gold (14k+) as your base metal.
- Avoid brass, bronze, and unlabeled alloys - especially during workouts or in humid conditions.
- With gold-plated pieces, check what the base is. Gold plating over brass = green skin once it wears through.
- If you're unsure of a piece's metal, wear it on your wrist for an hour; if the skin turns green, the base is copper-heavy.
ORNALIO pieces are made with 316L stainless steel - a copper-free, medical-grade base that doesn't react with skin. Shop jewelry that won't turn your skin green.