Before you sell anything, it helps to know whether you’re holding solid gold or something dressed up to look like it. There’s no single trick that settles it at home, but there are reliable clues you can read in a minute, and a few popular “tests” worth skipping. Here’s how to tell if your jewelry is real gold before you sell it, without damaging the piece.
Start with the hallmark
The fastest clue is stamped on the piece. Look on the clasp, the inside of a band, or the back of a pendant for a tiny mark. Numbers like 10K, 14K, 585, and 750 point to solid gold and its purity. A 925 stamp means sterling silver, not gold.
Watch for letter codes too. Marks like GP (gold plated), GF (gold filled), or HGE (heavy gold electroplate) tell you the gold is only a thin layer over another metal. Those aren’t solid gold, though a plated piece can still look convincing. No stamp at all doesn’t automatically mean fake, especially on older or handmade jewelry, but it does mean you’ll want a proper test.
Clues you can check at home
These won’t prove anything on their own, but together they point you in a direction:
- Heft. Real gold is dense and feels heavier than it looks. Many fakes, like brass or plated pieces, feel surprisingly light for their size.
- The magnet check. Gold isn’t magnetic. If a piece jumps to a magnet, it’s not solid gold. Just remember the reverse isn’t proof, since plenty of non-gold metals aren’t magnetic either.
- Skin marks. Solid gold usually doesn’t leave a green or black mark on your skin over time. Plated pieces often do once the coating wears.
- Color and shine. Real gold has a warm, even tone. A piece that looks too brassy, or shows a different color where it’s worn, is worth a closer look.
- The water float test. Because gold is dense, a solid piece drops fast and sinks in a glass of water, while some hollow or plated fakes hover or settle slowly. Read it as a weak clue, not proof, since plenty of other heavy metals sink too.
The tests worth skipping
The internet is full of home gold tests, and most of them are either unreliable or a good way to ruin your jewelry. Vinegar doesn’t give a trustworthy result, and dropping acid on a visible spot can leave a mark. Flame and lighter tests can discolor or damage a piece. Scratching and biting belong in old movies, not real life. If a “test” risks harming the item you’re about to sell, it isn’t worth the few seconds it saves.
The only way to know for sure
Real confirmation comes from a proper test, done where it won’t show. A jeweler or gold buyer uses a small acid test on a hidden area, or an XRF analyzer that reads the metal’s exact makeup without a scratch. That’s how the guesswork ends. It takes seconds, and at a buyer it’s part of a free evaluation, so there’s no reason to gamble on a home method.
This is also where “plated” gets sorted from “solid.” If your piece is gold filled or plated, a test shows it, and a buyer will tell you straight rather than pricing plated metal as solid gold. Our guide on what gold buyers look for covers how that check fits into an offer.
Bring it in and know for certain
If you’re in Boston and want a real answer, bring the piece to either of our Dorchester stores. We’ll test it in front of you, tell you whether it’s solid gold, and explain what it’s worth if it is. Even broken or unstamped pieces are welcome, since we’re testing the metal, not judging the shape. Start on our cash for gold page, or read how selling gold works before you come by. If it turns out to be a jewelry piece worth keeping whole, our jewelry team can weigh in too.
Once you find a mark, it maps to a purity level. The number is the karat, and higher means more gold, while a 925 stamp is the exception, since it means sterling silver rather than gold.
Gold purity by karat
| Stamp | Karat | Gold content |
|---|---|---|
| 10K / 417 | 10K | 41.7% |
| 14K / 585 | 14K | 58.5% |
| 18K / 750 | 18K | 75% |
| 22K / 916 | 22K | 91.7% |
| 24K / 999 | 24K | 99.9% |
Common questions
What are simple ways to check gold at home?
Look for a hallmark like 10K, 14K, 585, or 750, feel the heft, and try the magnet check, since gold isn’t magnetic. These are clues, not proof. A professional acid or XRF test is the only way to be certain.
Can vinegar detect fake gold?
Not reliably. Vinegar reactions are easy to misread and can vary with the alloy, so a “pass” doesn’t confirm solid gold. Skip it and get a proper test instead.
Does the magnet test really work?
Partly. Because gold isn’t magnetic, a piece that sticks to a magnet isn’t solid gold. But a piece that doesn’t stick still might not be gold, since many fake metals aren’t magnetic either. Use it as a first screen, not a verdict.
How can I check gold instantly?
No home method is instant and certain, so treat the quick checks as clues rather than proof. The fastest reliable read comes from an XRF analyzer in the store, which shows the metal’s exact makeup in seconds without a scratch, and it comes as part of a free evaluation.