Pure gold does not tarnish, because it does not react with oxygen or sulfur. Karat gold can discolor slightly, because its copper and silver alloy metals react with sulfur, sweat and chemicals. 18K gold rarely tarnishes, 14K may dull over years, and 10K darkens most. Warm soapy water removes the film.
Jump to a section
The answerWhy it happensWhat damages goldHow to clean itPreventionReal or fake?FAQGold has a reputation for never tarnishing, and pure gold lives up to it. But most gold jewelry is an alloy, and the metals mixed into it can dull, darken or react with chemicals over time. This guide separates what gold itself does from what its alloys do, and explains how to keep every karat bright.
Does gold tarnish?
Pure gold does not tarnish. Gold is one of the least reactive metals, and it does not combine with oxygen or sulfur in normal conditions, which is why ancient gold objects come out of the ground still bright. Most gold jewelry, however, is karat gold: gold mixed with metals such as copper, silver and zinc for strength. Those alloy metals can react with air, sweat and chemicals, so karat gold can develop a light film or dull over time.
The amount of tarnish depends mainly on the karat. 18K gold is three quarters gold and rarely shows any change. 14K gold is a little over half gold and may dull slightly after years of wear. 10K gold contains more alloy than gold and is the most likely to darken. In every case the film sits on the surface and comes off with gentle cleaning.
24K
Pure gold, which does not tarnish
75%
Gold in 18K, which rarely shows tarnish
41.7%
Gold in 10K, the karat most likely to dull
Why does karat gold discolor?
Karat gold discolors because of what is mixed into it. Copper and silver react with sulfur compounds, which are found in air pollution, wool, rubber, some foods and the natural oils on the skin. The reaction forms a thin dark layer of sulfides on the surface. Copper can also react with sweat and moisture, which is the same chemistry that leaves a green line on the skin; the guide to why jewelry turns skin green covers that in detail.
Rose gold contains more copper than yellow gold of the same karat, so it can deepen in color over many years. White gold is usually rhodium plated, so its surface does not tarnish, but the plating wears and reveals the slightly warmer alloy underneath. That change is wear, not tarnish, and replating restores the color.
What looks like tarnish is often something else. A dull, cloudy surface is usually a film of soap, lotion or skin oil. A gray smear on the skin under a ring is often metal rubbed off by makeup. Fine scratches scatter light and make polished gold look less bright. Each has a different fix, so it is worth identifying the cause before cleaning.
Gold color and karat also affect how a change looks. A slight darkening is hard to see on deep yellow 18K but more noticeable on pale 10K, and a film on rose gold can read as a richer, deeper pink rather than dullness. If only one area of a piece has changed color, such as the inside of a band or the back of a pendant, the cause is usually contact with skin, lotion or fabric rather than the metal itself.
What damages gold jewelry?
Chlorine. Chlorine bleach and pool water attack the alloy metals in karat gold. Repeated exposure can pit the surface, weaken the metal around solder joints and, over time, cause cracks. This is the most serious threat to gold jewelry, and it is the reason to take rings off before swimming, using a hot tub or cleaning with household products.
Harsh cleaners and abrasives. Toothpaste, baking soda pastes and scouring powders scratch gold and wear away fine detail. Silver dip and jewelry cleaners made for silver are not designed for gold and can discolor some alloys.
Cosmetics and sulfur. Makeup, sunscreen and perfume leave residue that dulls gold, and sulfur-rich environments such as hot springs speed up tarnish on low-karat alloys. Putting jewelry on last, after cosmetics have dried, prevents most of this.
| Type | Gold content | Tarnish resistance | What to expect |
|---|---|---|---|
| 24K gold | 99.9% | Will not tarnish | Too soft for most everyday pieces |
| 18K gold | 75% | Excellent | Rarely shows any film |
| 14K gold | 58.5% | Very good | May dull slightly over years; cleans easily |
| 10K gold | 41.7% | Good | Most alloy of the karat golds; can darken faster |
| Gold-filled | At least 1/20 by weight | Good while the layer lasts | Base metal shows only with heavy wear |
| Gold-plated | Thin surface layer | Poor once worn | Plating wears and base metal tarnishes |
Gold-plated jewelry behaves differently because only the surface is gold. Once the plating wears through, the base metal underneath tarnishes quickly. The guide to gold-filled, gold-plated and vermeil explains how long each construction lasts.
How do you clean tarnished gold?
Most dull or tarnished gold comes clean with warm water and mild dish soap. Soak the piece for 15 to 20 minutes, brush gently with a soft toothbrush, paying attention to the back of settings and the inside of bands, then rinse in clean water and dry with a lint-free cloth. For a light film, a jewelry polishing cloth made for gold restores the shine.
Avoid chlorine, bleach, abrasive pastes and silver dips. If a piece set with soft or porous gemstones such as pearls, opal or emerald needs cleaning, wipe the metal with a damp cloth rather than soaking. For pieces with deep tarnish, heavy scratches or worn rhodium plating, a jeweler can clean, polish and replate them professionally. The step-by-step guide to cleaning gold jewelry covers each method in detail.
Gentle First
Start with the mildest method and only move to stronger ones if needed. Warm soapy water removes most film, and anything more aggressive risks scratching the metal or loosening stones.
How do you keep gold from tarnishing?
Gold stays bright with a few simple habits. Put jewelry on after lotion, perfume and makeup have dried, and take it off before swimming, cleaning, exercising or using a hot tub. Wipe pieces with a soft cloth after wearing to remove skin oils before they build up.
Store gold in a dry place, ideally in a fabric-lined box or individual pouches so pieces do not scratch each other. Keep it away from rubber bands and wool, which contain sulfur. Clean everyday pieces every few weeks and have rings checked by a jeweler once or twice a year so worn prongs and thinning plating are caught early. The complete fine jewelry care guide covers storage and cleaning for every metal.
Best karat for tarnish resistance
18K gold offers the best balance of tarnish resistance and durability for everyday wear. 14K is harder and still highly resistant. 10K is the most affordable karat but contains the most reactive alloy.
Can tarnish show that gold is fake?
Tarnish alone does not prove that gold is fake. Genuine 10K and 14K gold can develop a light film because of their alloy metals. What tarnish can reveal is a plated piece: if a gold-colored item turns dark, green or patchy quickly, especially at edges and high points, the gold layer may have worn through to base metal.
Look for a karat stamp such as 10K, 14K, 18K, 417, 585 or 750, and check for a different color showing through at worn spots. Since a 2018 update to the FTC jewelry guides, US sellers may call any gold alloy gold only with an equally clear karat disclosure, so the stamp matters more than the color. The tests in the guide how to tell if your jewelry is real gold help you check, and a jeweler can confirm the metal with an acid or XRF test.
"Chlorine bleach, another common household solvent, can pit or damage gold alloys."
GIA, Tips on Caring for Jewelry
Gemological Institute of America, gia.edu
Further reading: Royal Society of Chemistry on the element gold. The Royal Society of Chemistry describes gold as chemically unreactive, dissolving only in aqua regia, a mixture of nitric and hydrochloric acids. It is the alloy metals in karat gold, not the gold, that react.
In Short
1Pure gold does not tarnish; the copper and silver in karat gold can form a light surface film.
2Higher karat means less tarnish: 18K rarely shows any, 14K may dull over years, 10K darkens most.
3Clean with warm water and mild soap, avoid chlorine and abrasives, and put jewelry on after cosmetics.
Want the full gold care reference?
The Oath jewelry guide covers karats, metals and care for every type of fine jewelry in one place. We will email it to you.
Email Me the Guide →
Every order ships free with a 30-day return policy.
Gold itself never tarnishes, and well-made karat gold resists it for years. Choose the karat that suits your wear, keep it away from chlorine and harsh cleaners, and a quick wash in warm soapy water will restore any dullness. Every order ships free with a 30-day return policy.
Frequently Asked Questions
01
Does 14K gold tarnish?
14K gold is highly resistant to tarnish, but because it is 58.5% gold, its copper and silver alloy can dull slightly over years of wear. The film is on the surface only and comes off with warm water, mild dish soap and a soft brush.
02
Does 18K gold tarnish?
18K gold rarely tarnishes, because it is 75% gold and contains little reactive alloy metal. It may pick up a film of skin oil or lotion, which looks like tarnish but washes away with soapy water.
03
Does 10K gold tarnish?
10K gold can tarnish more readily than higher karats, because it is only 41.7% gold and contains more copper and silver than gold. It is still durable and cleans easily, but it may need cleaning more often to stay bright.
04
Does gold-plated jewelry tarnish?
Gold-plated jewelry tarnishes once the thin gold layer wears through and exposes the base metal underneath. Plating lasts longest on pieces with little friction, such as earrings and pendants, and wears fastest on rings and bracelets.
05
Can you shower with gold jewelry?
Gold jewelry will not tarnish from plain water, but soap and shampoo leave a dulling film and shower products can build up under settings. Chlorinated pool and hot tub water is more damaging, so remove gold before swimming.
06
What is the black stuff on my gold ring?
Black residue on a gold ring is usually a mix of skin oil, soap and lotion, or tarnish on the copper and silver in the alloy. Makeup can also rub fine metal particles off the ring. Soaking in warm soapy water and brushing gently removes it.