How to Tell if Gold Is Real: 8 Tests for Coins and Jewelry

By Mark Sandulli · Founder & editor · Updated October 14, 2026

Short answer: for jewelry, start with the stamp and a magnet. For coins and bars, weigh and measure them against the official specs. No single home test is proof, and the most dangerous fakes (gold-plated tungsten) pass most of them. The surest protection is buying from a reputable dealer.

Quick checks for any gold

1. Look for the stamp

Real gold jewelry is usually stamped with its purity, often inside a ring or near a clasp.

Fakes can carry fake stamps, so a stamp alone isn't proof.

2. The magnet test

Gold isn't magnetic. If a strong magnet (a rare-earth or neodymium one) grabs the piece, it isn't solid gold. If it doesn't, that proves little: copper, brass and tungsten aren't magnetic either.

3. The color and wear check

Look at edges and high points where plating wears first. A different-colored metal showing through means it's plated. Real gold has a warm, slightly soft yellow, not a mirror-bright or orange shine.

4. The skin test

Hold the piece for a few minutes. Green, blue or black marks on your skin point to a base metal or worn plating.

Tests for coins and bars

5. Weigh it

A digital scale accurate to 0.01 g costs $20–50. Compare against official specs. A 1 oz American Gold Eagle should weigh 33.931 g (it's 22-karat, so it weighs more than an ounce of pure gold).

6. Measure it

Digital calipers cost under $30. The Gold Eagle should measure 32.7 mm across and 2.87 mm thick. A fake can match the weight but not the size, or vice versa, because most metals are lighter than gold.

7. The ping test

Balance the coin on a fingertip and tap it gently with another coin. Real gold rings with a long, clear tone; many fakes give a dull clunk. Free phone apps can analyze the ring.

8. Density (water) test

Weigh the item in air, then suspended in water. Gold's density is about 19.3 g/cm³. A result well below that means it isn't solid gold.

The fake home tests can't catch: tungsten

Tungsten is almost exactly as dense as gold (19.25 vs. 19.32 g/cm³). A gold-plated tungsten bar can pass the weight, size and density tests. Catching it takes a dealer's electronic tester, which reads conductivity through the metal (devices like the Sigma Metalytics verifier), or a professional assay. Many dealers test items for a small fee.

Tests to skip: biting (other soft metals dent too), lighters or acid kits on bullion (they can damage the item and its resale value), and the ice test (silver and copper conduct heat even better than gold).

How to avoid fakes in the first place

• Buy from established dealers that guarantee authenticity. Our price comparison lists major online dealers.
• Be most careful with online marketplaces, estate sales and private sellers, especially when the price is below spot. Real gold is never sold below what it's worth as metal.
• The most-faked items are the most popular: 1 oz Gold Eagles, Krugerrands and generic 1 oz rounds.
• Graded coins in PCGS or NGC holders can be checked by serial number on the grader's website.

Frequently asked questions

Does real gold sink? Yes, immediately, but so does most metal. Only measuring density tells you much.

Can I trust a jeweler's acid test? It shows surface purity, but a thick plating can pass. For bullion, an electronic or assay test is better.

What should I do if I think I bought a fake? Don't resell it. Contact the seller in writing, and have a dealer or assay office test it. If you paid by card, ask your card issuer about a dispute.

Compare prices from established dealers → · Where to buy gold online →

This is general information. For a definitive answer on a valuable item, get it professionally tested.

Sources: USAGold: How to test gold coins, Apr 2026 · Jaxxon: 7 tests for gold jewelry