How to Spot Fake Coins: 7 Tests Every Collector Should Know

Weight, diameter, reeding count, magnet test, edge inspection, design detail, and ring test. Seven checks that catch nearly every counterfeit.

The counterfeit coin market has exploded over the last fifteen years, driven primarily by sophisticated operations in China producing silver-plated base-metal fakes of Morgan dollars, Trade dollars, and classic gold coins. The good news: most of these fakes are detectable at home with a scale, a caliper, a magnet, and about five minutes of careful inspection. This guide covers the seven tests every collector should run before paying real money for any raw (ungraded) coin.

The seven-test checklist

1. Weight

Every US coin has a specified weight, and genuine coins fall within a narrow tolerance — usually ±2%. Most counterfeits, especially silver-plated base metal fakes, are noticeably off. A genuine 1921 Morgan dollar weighs 26.73 grams. A silver-plated lead or zinc fake typically weighs 23–25g. A digital scale accurate to 0.01g ($15) catches 80% of fakes in under thirty seconds.

2. Diameter

Measure the diameter with a caliper. Genuine US coins are struck to tight tolerances — a Morgan dollar measures 38.1mm ± 0.1mm. Counterfeits are frequently off by 0.5mm or more. This test alone catches many fakes that pass the weight test.

3. Reeding count

The grooves around the edge of a coin (reeding) are struck into specific counts that counterfeit operations often get wrong. A genuine Morgan dollar has 189 reeds. A genuine Walking Liberty half dollar has 150. Count them under magnification. If the count is off or the reeding is uneven, you're looking at a fake.

4. Magnet test

Silver and gold are not magnetic. Base metals used in counterfeits (especially iron, steel, or nickel) usually are. Hold a strong rare-earth magnet near the coin — genuine precious metal coins will not attract. This test alone will catch the cheapest category of fakes instantly.

5. Edge inspection under magnification

Look at the edge of the coin under 10x magnification. On a genuine silver-clad coin (post-1965 dimes, quarters, halves) you'll see a distinct copper layer sandwiched between two silver-colored layers. Counterfeits often show uniform metal all the way through, or a plated coating visible at chip points.

For pre-1965 silver coins (which are solid silver), look for seams or casting lines around the edge — genuine coins were struck, not cast, and show no such marks. Cast counterfeits almost always show a faint seam.

6. Design detail and lettering

Under magnification, compare the coin's design details against a reference image of a genuine coin. Counterfeits frequently show:

• Soft, mushy lettering versus crisp, sharp genuine lettering.
• Wrong font style on the date (famously: counterfeit Morgan dollars often have a "7" with a different serif than genuine).
• Missing mint mark detail or a mint mark that looks "floaty" (punched separately onto a fake die).
• Incorrect or missing designer initials (VDB on Lincoln cents, LG on Peace dollars).

7. Ring test (for silver)

Balance a silver coin on your fingertip and tap it with another coin or a small hammer. Genuine silver coins ring with a high, sustained tone. Counterfeit silver-plated base metal coins produce a dull thud. Not conclusive on its own (some genuine coins with hairline cracks thud too) but very useful as a confirmation test.

When in doubt, submit or decline

The last test is economic. If a coin costs more than $100 raw and passes all six tests above but you still have any doubt, either decline the purchase or insist on certification before paying. PCGS and NGC both offer "authentication-only" services that cost less than full grading and give you a verified-genuine holder. The $20 fee is cheap insurance on a $500 coin.

For extremely high-value coins ($1,000+), the only safe purchase is an already-slabbed coin from PCGS or NGC. No home test is reliable enough at that price point.

Tests that don't work (despite internet claims)

"Bite test" — leaves tooth marks, doesn't reliably distinguish silver from lead. Skip.

"Ice test" — claims silver melts ice faster due to thermal conductivity. Not reliable in practice. Skip.

"Acid test" — damages the coin permanently and only works on visible metal. Use only as a last resort on scrap.

"Sound test via apps" — microphone apps that claim to identify silver by tone are not accurate enough to trust.

Stick with the seven tests above. They're tedious the first few times, fast once you've done them for a year, and they've prevented more beginner losses than every other piece of numismatic advice combined.

What to read next

Already authenticated a valuable find? Our grading service comparison walks you through what to submit where. And never clean a coin before authenticating it — cleaning hurts value even more than counterfeit doubt.