14K Gold and Tarnish: What Actually Darkens

24K gold is about 99.9 percent gold. It does not oxidize in air the way silver does, and it does not rust. Jewelry is made from alloys because 24K bends and scratches if you look at it wrong. The karat number is the fraction of the 24 parts that are gold.

Yellow alloys lean on copper, silver and zinc. Rose leans harder on copper, which is why it looks pink and also why a rose piece can show dark spots if the copper reacts. White gold is alloyed to look pale. In the trade it is often plated with rhodium, a bright white metal that wears off high points and shows a warmer color underneath. That wear is not tarnish of the gold. It is a finish getting thin. How rhodium fits white gold is covered in white gold and rhodium. The karat math is the gold karat guide.

The usual list is boring and accurate.

• Soap, lotion and skin oil sit in the links and make gold look gray. That film is not a chemical change. It wipes off.
• Sweat and salt work on the copper in the alloy, especially on rose gold and on pieces worn at the gym.
• Chlorine in pools attacks gold alloys. Take chains off to swim. This is the one that pits metal, not just dulls it.
• Perfume, hairspray and household cleaners belong on skin and counters before the jewelry goes on, never after.
• Sulfur in some hot springs, and the air in some industrial areas, darkens silver in an alloy. Gold jewelry with a silver-rich mix can show that.

A chain that lives on a neck every day will look worse than the same chain worn twice a week, because of contact, not because 14K "expires." Cleaning steps for a chain are in how to clean a gold chain. Diamond pieces with the same gold follow how to clean diamond jewelry.

For dull 14K that has not been pitted:

1. Mix warm water and a drop of mild dish soap in a bowl.
2. Soak the piece for 15 to 20 minutes. Not boiling water.
3. Brush gently with a soft toothbrush, including under the links and around the clasp.
4. Rinse in clean warm water.
5. Dry with a soft cloth. Let a chain finish drying in the air before you box it, so water is not trapped in hollow links.

That is the same home method GIA describes for most jewelry. Skip toothpaste. It is abrasive and it scratches high-polish gold. Skip baking soda paste on pieces with stones you cannot identify. A polishing cloth made for gold, used lightly, takes haze off a smooth surface. It does not reach inside a Cuban link. Do not use a cloth on porous stones or pearls.

If the dark color is only in deep crevices and the high spots are still yellow, you are looking at dirt. If the high spots themselves are rough, pink at the edges, or eaten away, chlorine or a chemical has damaged the alloy. Cleaning will not rebuild missing metal. A bench can polish some of that damage. Polishing removes gold. That is a tradeoff, and it is not a service we list as included.

More home polish detail is in how to polish gold at home.

A green or gray line on the skin is usually the alloy, or a reaction with lotion, not the gold dissolving onto you. Copper in 10K and 14K is the common source. Acid sweat makes it more likely. The longer explanation is why jewelry turns skin green. If the skin itself is reacting, itchy or blistered, that can be nickel in a white gold alloy. Nickel sensitivity is a skin issue. Read gold allergy and sensitive skin and talk to a doctor if it is more than a mark. We do not claim our white gold is nickel-free.

Plated and gold-filled jewelry darkens in a meaner way. The gold layer wears off and the base metal shows. That base metal can tarnish hard, and no amount of soap brings gold back once the plate is gone. The Franky catalog is filed as 10K, 14K and one 18K piece, not as plated fashion jewelry. A stamp should agree with the listing. If a piece has no stamp, ask before you treat it as karat gold.

18K tarnishes less because there is less alloy, not because it is magic. It also scratches faster. The only 18K listing in the live file is a natural diamond ring. Most of what people wear from this shop is 10K or 14K, and both will look new again after a real cleaning if the metal is intact.

It is not proof the chain is fake. Fake gold plate that has worn through looks dark too, which is why the stamp and the weight still matter. It is not a reason to boil the chain or to run steel wool over it. It is not covered by a warranty term we did not publish. Keep 14K dry when you store it, away from perfume bottles, and clean it when the color goes flat. The storage habits are in how to store fine jewelry.

If you want the dull piece looked at in person, the showroom is at 7900 NW 27th Ave, Unit 506, Miami FL 33147, phone 954-504-5640. Bring the piece. A photo of "it looks dark" is not a diagnosis.