How to Tell If Your Necklace Is Real Gold

You found a necklace at an estate sale, inherited a chain from a relative, or picked something up at a vintage market. And now you're wondering: is this actually gold?

It's a smart question. Gold-plated, gold-filled, and gold-toned pieces are everywhere, and they can look almost identical to solid gold. Knowing how to tell the difference can protect you from overpaying, undervaluing something, or missing out on a piece that's worth more than you think.

First: Solid Gold vs Gold-Plated vs Gold-Filled

Before testing anything, it helps to know what you're actually trying to distinguish between:

• Solid gold: the entire piece is made of a gold alloy throughout (10K, 14K, 18K, etc.). It won't wear off. This is what you're hoping to confirm.
• Gold-plated: a very thin layer of gold is electroplated over a base metal like brass or copper. It looks identical to solid gold but the gold layer wears away over time, revealing the metal underneath.
• Gold-filled: a thicker layer of gold is mechanically bonded to a base metal. More durable than plated, but still not solid gold and worth significantly less.

The tests below are designed to help you tell these apart. No single test is definitive on its own:  use two or three together to build confidence.

1. Look for Hallmarks (Start Here)

The fastest, most reliable first step is finding and reading the hallmark — a small stamped mark that tells you the metal's purity. On necklaces and chains, this is almost always located near the clasp.

Look for numbers like these:

If you see any of those stamps, you have a strong indicator of real gold. A jeweler's loupe at 10x magnification, available cheaply online, makes reading tiny hallmarks much easier.

Watch out for misleading stamps too: GP (gold plated), GF (gold-filled), GE (gold electroplated), and RGP (rolled gold plate) all contain some gold but far less than solid gold, and their value is dramatically lower.

No stamp at all doesn't automatically mean fake. Very old pieces, handmade jewelry, and some international pieces may lack hallmarks. But it does mean you should keep investigating.

2. The Magnet Test

Real gold is not magnetic. In fact, gold is slightly diamagnetic, meaning it's very gently repelled by magnets.

Hold a strong magnet (a rare-earth or neodymium magnet works best, a fridge magnet is too weak) near your necklace:

• No attraction at all: consistent with real gold, though not conclusive on its own
• Mild attraction: the clasp or findings may be a different metal, which is common and doesn't disqualify the chain
• Strong attraction: the piece is likely iron, steel, or another magnetic metal, so probably not solid gold

Keep in mind that some non-gold metals like copper and silver are also non-magnetic, so passing the magnet test alone doesn't confirm gold. But failing it pretty clearly signals you're not looking at solid gold.

3. Look for Discoloration or Wear-Through

Real solid gold maintains a consistent color all the way through. There's no base metal to show through, because there isn't one.

Look closely at the areas that get the most friction and wear: around and behind the clasp, at the ends of the chain, and any surface that regularly contacts skin. If you notice silver, copper-colored, or grey tones where gold color has worn away, the piece is plated or filled, not solid gold.

On a necklace with a pendant, also check the bail — the small loop connecting the pendant to the chain. It's a structural point that gets stress and often reveals the truth about a piece faster than other areas.

4. The Ceramic Streak Test

This one surprises people but it works. Find an unglazed ceramic tile or plate (the rough, unfinished underside of a regular tile works). Gently drag your necklace across the surface with light pressure.

• Gold streak: consistent with real gold. Genuine gold is soft enough to leave behind actual gold particles, creating a yellow-gold line.
• Black or dark streak: a sign the piece is fake gold or heavily base-metal.

A word of caution: this test creates small scratches on the jewelry, so do it on an inconspicuous spot — ideally the clasp or a hidden section of chain. Don't use this on a piece you think might be valuable without doing other tests first.

5. The Skin Test

Real gold doesn't react with skin. If you wear a gold necklace and notice green marks on your neck, that's almost always a sign of a copper base or a high-copper alloy like rose gold. Black marks can mean silver content reacting with skin acid. No marks at all is consistent with solid gold.

This one takes time since you'd need to wear the piece for a few hours, but if you've already noticed discoloration in the past, that's useful information.

Worth noting: some high-karat gold alloys with copper content, like rose gold, can leave faint greenish marks on people with particularly acidic skin. That doesn't mean the piece is fake. It's an alloy reaction, not a plating issue.

6. The Vinegar Test

White vinegar is a mild acid that can give you a quick read on whether a piece is real gold. Apply a few drops to the metal (or briefly dip the necklace in a small bowl of white vinegar) and watch for about 15 seconds.

• No color change: consistent with real gold, which doesn't react to vinegar
• Color change or discoloration: indicates base metals that react to acid, suggesting the piece isn't solid gold

This is a gentler version of the acid test and won't damage genuine gold. It's not as precise as a proper acid testing kit but it's a useful quick check when you don't have other tools handy.

7. The Acid Test

This is one of the most reliable at-home tests, though it requires purchasing an acid testing kit. These are available at jewelry supply stores or online for about $20 to $40 and include different acid solutions calibrated for different gold karats.

How it works: make a small scratch on an inconspicuous spot on your necklace, ideally the clasp, apply a small drop of acid, and watch:

• No reaction: the metal resists the acid, consistent with gold at the indicated karat
• The mark turns green: base metal or low-karat gold
• The mark turns milky or white: sterling silver
• No visible change: may indicate gold plating over a resistant metal

Nitric acid testing is genuinely accurate and widely used by gold buyers and pawnshops. If you're comfortable handling small amounts of acid carefully, it's a worthwhile step before getting a professional appraisal.

8. Get a Professional Appraisal

The most accurate way to know for certain is a professional test. Certified gemologists and appraisers use methods that leave no room for ambiguity:

• XRF (X-ray fluorescence) analysis: non-destructive, highly accurate, gives a full breakdown of metal composition in seconds
• Fire assay: the gold-standard of purity testing, destructively accurate to a fraction of a percent
• Electronic gold testers: quick and non-destructive, though less detailed than XRF

A professional evaluation also gives you something no home test can: the actual value of your piece. Gold content is only one part of it. Craftsmanship, gemstones, designer provenance, and market demand all factor into what a necklace is truly worth.

Use Unvault's Gold Calculator to estimate melt value in real time. For a complete picture that accounts for everything, submit your piece for an online jewelry appraisal from Unvault's certified experts.

What If the Tests Are Inconclusive?

Home tests narrow things down but rarely give a definitive answer on their own. A simple way to think about it:

• Has hallmarks (10K through 24K), passes the magnet test, no visible wear-through: very likely solid gold. Confirm with a professional test before selling.
• Has a GP, GF, or no hallmark, plus it's magnetic or shows wear-through: likely plated or filled. Still worth verifying before discarding since plated pieces on silver bases can carry silver value.
• Genuinely uncertain: a professional XRF test is worth the cost, especially if the piece is heavy.

Does Tarnish Mean It's Not Real Gold?

Not necessarily. When looking at selling 14K gold or selling 10K gold, it is important to note that they can develop a slight tarnish over time due to their alloy metal content. Tarnish on the surface doesn't change the gold underneath.

If a necklace looks a bit discolored but has genuine hallmarks and passes the magnet test, it may just need a good cleaning.

Ready to Find Out What Your Gold Is Worth?

Once you've confirmed the necklace is real gold, the natural next question is what it's actually worth. Use the Gold Calculator for a quick estimate based on weight and karat. Get a full online jewelry appraisal for a comprehensive valuation. Or if you're ready to sell, explore options to selling 14K gold or sell 18k gold with Unvault.

Quick Reference: All 8 Tests

No single home test is conclusive on its own. Use two or three together to build confidence, and when real money is on the line, get a professional assessment.

Last updated: June 2026. Gold hallmarking standards vary by country. If you have a piece from an unfamiliar region, a local appraiser is worth consulting.

‍