How to Spot Counterfeit Gold and Silver Coins and Bars (and Buy Bullion Safely)

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A safe protects what you put in it. It can’t tell you whether the coin was real to begin with. Counterfeit bullion coins and bars are a real problem, and some are good enough to fool a magnet, a quick glance, and even a scale.

This guide covers the part that comes before storage: buying from sources that make fakes unlikely, simple checks you can do at home, the limits of those checks, and how to verify graded coins. For storing metal once it’s home, see our guides to storing gold and silver bullion and storing a coin collection.

This article is general information, not financial or authentication advice. For valuable pieces, use a reputable dealer or professional grading service.

How common are fakes?

Common enough that Germany’s central bank tracks them. A Deutsche Bundesbank presentation to the London Bullion Market Association (LBMA) in March 2017 reported that its national analysis center encountered 1,570 counterfeit precious-metal coins in 2016. It described two broad types:

• Fakes with real gold content, typically 45% to 93% gold, given away by small differences in striking quality, edge lettering, and the number of edge reeds.
• Fakes with a non-gold core such as steel, zinc, or copper alloy, coated with a thin gold layer. Newer versions use a tungsten core. ACEF notes counterfeiters favor tungsten because its weight is close to gold’s.

The second type is the one to worry about, because it’s designed to pass the easy tests.

Step 1: Buy where fakes are unlikely

The best counterfeit test is a good seller. Federal regulators’ advice:

• Ignore unsolicited offers. The CFTC and FINRA say never to respond to cold calls, unsolicited emails, infomercials, social media posts, or pop-up dealers at events or at your door.
• Start local and check history. The same advisory says to start with well-established local dealers. It notes retail metal dealers aren’t regulated at the federal level, so check with your state attorney general or securities regulator for complaints. For online dealers, verify the physical address and how long they’ve operated.
• Use industry-vetted dealers. NGC suggests buying from American Numismatic Association (ANA) member dealers, who agree to a code of ethics, or from Professional Numismatists Guild (PNG) members.
• Know the melt value. The FTC says to ask for a coin’s melt value. The CFTC advises multiplying the metal weight by the spot price and comparing it with what you’re being charged. It says some fraudulent dealers have charged spreads of more than 300%, while other dealers charge less than 20%.
• Get everything in writing. The CFTC says to get fees, commissions, and the agreed price in writing before you pay, and to ask the dealer’s buy-back price. The FTC says to always get a receipt and to refuse any pitch that pushes you to “act now.”
• Be wary of “semi-numismatic.” The CFTC calls it a made-up industry term that has no special meaning.

A separate scam to know: the FTC warns that no real government agent will ever tell you to buy gold bars and hand them to a courier “to protect your money.” That’s a scam every time.

Step 2: Know what “COPY” means

Under the Hobby Protection Act, an imitation coin made in or imported into the U.S. must be plainly and permanently marked “COPY.” The FTC’s rule says the word must appear in English capital letters on the front or back, not the edge. Selling an unmarked imitation is unlawful too.

So a coin stamped “COPY” is a legal replica, not bullion. An unmarked fake is still possible, because counterfeiters ignore the law.

Step 3: Check weight, diameter, and thickness

The Anti-Counterfeiting Educational Foundation (ACEF) calls weight and diameter the most cost-effective and reliable way to catch most fake gold and silver coins. Sophisticated fakes may match the diameter, it says, but rarely the exact weight. Government and private mints publish their specifications, and ACEF recommends buying a digital scale and calipers before your first coin.

U.S. Mint specifications for common bullion coins:

Coin	Weight	Diameter
American Gold Eagle, 1 oz	33.931 g	32.70 mm
American Gold Buffalo, 1 oz	31.103 g	32.70 mm
American Silver Eagle, 1 oz	31.103 g	40.60 mm

The Gold Eagle weighs more than one troy ounce because it’s 22-karat: 91.67% gold plus silver and copper. It still contains one troy ounce of pure gold.

Where this test runs out. The Bundesbank compared a tungsten-core fake of the 1-ounce Gold Eagle with a genuine coin:

• Weight: 33.919 g fake vs. 33.947 g genuine
• Diameter: 32.71 mm vs. 32.69 mm
• Thickness: 2.76 mm vs. 2.82 mm

The fake was within about a hundredth of a gram of the Mint’s 33.931 g spec, so a pocket scale wouldn’t flag it. Comparing thickness against a known genuine coin might. What gave the fake away was density: 15.89 g/cm³ versus 17.62 for the genuine coin. A good tungsten fake can pass a casual weight check, so treat a match as “no red flag,” not as proof.

What to look for: a digital pocket scale with 0.01 g resolution.

See 0.01 g digital pocket scales (paid link)

What to look for: digital calipers.

See digital calipers (paid link)

Step 4: Look closely

Under magnification, compare the coin with known-genuine examples or reference photos. The Bundesbank uses microscopes to spot minting defects such as depressions, raised lines, or points, along with flaws in edge lettering. NGC says transfer die fakes can be the most deceptive. The die is made from a real coin, so every fake struck from it shares the same marks. Graders watch for those repeating marks and soft details.

NGC also notes that cast fakes and electrotypes often have a seam around the edge, and that because they aren’t struck, they usually won’t “ring” like a genuine coin when lightly tapped.

What to look for: a 10x jeweler’s loupe.

See 10x jeweler’s loupes (paid link)

Why magnets and acid aren’t enough

• Magnets. ACEF says a magnet used to be enough, because older fakes had iron, steel, or nickel cores. Today’s fakes often use non-magnetic cores such as lead, copper, or brass. Gold fakes favor tungsten, and the Bundesbank notes magnetism catches base-metal fakes except tungsten. A magnet that sticks is a red flag; one that doesn’t proves nothing.
• Acid. ACEF calls acid testing the least desirable method, because if the coin is genuine you may ruin its surface.
• Surface readings. Handheld X-ray fluorescence (XRF) checks composition quickly, but the Bundesbank lists its penetration depth as under 0.05 mm. On the tungsten fakes it examined, the gold layer and the copper layer under it were only 10 to 35 micrometers thick combined. So a surface reading may mostly see the plating, not the core.

What professionals add. The Bundesbank uses density measurement and electrical conductivity testing. Conductivity readings can reach deeper into the metal, and it notes they can be taken through thin plastic foil, so sealed bullion can be checked without opening it. Its conclusion is the practical rule: use more than one method.

Graded coins: verify the holder, not just the coin

Graded coins sit in sealed holders, but the holders can be faked too. NGC says counterfeit and tampered NGC holders do turn up. Before buying:

1. Look up the certification number on NGC’s website or app. If NGC knows of a problem, the result may show alerts such as “Possible Counterfeit Holder” or “Reported Stolen.”
2. Compare the photos. NGC says that since October 2008, nearly every coin it has graded was photographed in its holder. Match the images to the coin in front of you: toning, marks, and label details. A genuine certificate number can be copied onto a fake holder.

Mint security features

Some modern bullion has built-in authentication. The Royal Canadian Mint says every die for its Gold and Silver Maple Leaf coins is laser micro-engraved with a textured maple leaf security mark. Its Bullion DNA system lets participating dealers photograph a coin and match it against the Mint’s database. It covers Gold Maple Leafs dated 2014 and later and Silver Maple Leafs dated 2015 and later.

Bars

The same rules apply. Buy recognizable refinery or mint products from established dealers, and compare weight and dimensions with the maker’s published specs. ACEF notes that mints publish specifications for their bars as well as their coins. Keep the original packaging and paperwork, and record serial numbers if the bar has them.

If you suspect a fake

• Stop and don’t resell it. Ask a reputable dealer or grading service to examine it.
• Report it. NGC points to the Numismatic Crime Information Center for counterfeits. Report dealer fraud to the CFTC or your state regulator, and impostor scams to the FTC at ReportFraud.ftc.gov.

After you buy

Record what you bought: date, dealer, weight, purity, mint, and certification or serial numbers. Keep the invoice. Our home inventory guide covers where to store those records. Then store the pieces in PVC-free holders inside a burglary-resistant safe, and keep humidity in check.

Quick checklist

• No cold calls, pop-up dealers, or “act now” pitches
• Established dealer, complaint history checked
• Melt value calculated; fees and buy-back price in writing
• Weight, diameter, and thickness checked against official specs
• Close look under a loupe
• Magnet and acid not relied on
• Graded coins: certificate looked up, photos compared
• Invoice, serials, and cert numbers recorded

Bottom line

Your best defense against fakes is the seller you choose. Buy from established dealers, know the melt value, and get terms in writing. At home, a scale, calipers, and a loupe will catch many fakes, but not every tungsten-core coin. When the stakes are high, use professional testing and verify graded holders against the grader’s photos.

Sources

1. Deutsche Bundesbank (R. Zils) — Counterfeit Gold Coins, LBMA presentation, March 2017 (1,570 counterfeit precious-metal coins in 2016; counterfeit types; tungsten-core Gold Eagle measurements; XRF depth; conductivity through foil; use more than one method). https://cdn.lbma.org.uk/downloads/S7_RZ.pdf
2. CFTC — Customer Advisory: 10 Things to Ask Before Buying Physical Gold, Silver, or Other Metals (cold calls; local dealers; no federal regulation of retail dealers; spot price; spreads; fees in writing; buy-back; “semi-numismatic”). https://www.cftc.gov/LearnAndProtect/AdvisoriesAndArticles/Metals10Things.html
3. Federal Trade Commission — Investing in Gold? What’s the Rush? (melt value; independent appraisal; receipts; refuse “act now”). https://www.govinfo.gov/content/pkg/GOVPUB-FT-PURL-gpo17827/pdf/GOVPUB-FT-PURL-gpo17827.pdf
4. Federal Trade Commission — Real government agents aren’t asking you to buy and deliver gold bars (July 2025). https://consumer.ftc.gov/consumer-alerts/2025/07/real-government-agents-arent-asking-you-buy-deliver-gold-bars
5. Cornell LII — 15 U.S. Code § 2101, Marking requirements (Hobby Protection Act; manufacture, import, or sale of unmarked imitation numismatic items is unlawful). https://www.law.cornell.edu/uscode/text/15/2101
6. eCFR — 16 CFR 304.6, Marking requirements for imitation numismatic items (“COPY” in capitals, obverse or reverse, not the edge). https://www.ecfr.gov/current/title-16/chapter-I/subchapter-C/part-304/section-304.6
7. Anti-Counterfeiting Educational Foundation — Magnets now unreliable to ID counterfeit coins! (non-magnetic cores; tungsten for gold fakes; acid testing; weight and diameter most reliable; published specs). https://acefonline.org/magnets-now-unreliable-to-id-counterfeit-coins/
8. U.S. Mint — Bullion Coin Programs (Gold Eagle, Gold Buffalo, and Silver Eagle weights, diameters, and composition). https://www.usmint.gov/coins-precious-metal-coins/bullion-coin-programs/
9. NGC — Counterfeit Detection (cast, electrotype, and transfer die fakes; ring test; ANA and PNG dealers; Numismatic Crime Information Center). https://www.ngccoin.com/resources/counterfeit-detection/
10. NGC — Always Verify Your NGC Coins with the NGC Website or App (certificate alerts including “Possible Counterfeit Holder” and “Reported Stolen”). https://www.ngccoin.com/news/article/7456/
11. NGC — Security Center (counterfeit holders; coins imaged since October 2008). https://www.ngccoin.com/security-center/
12. Royal Canadian Mint — Bullion DNA (micro-engraved security mark; dealer verification; Gold Maple Leafs 2014+, Silver 2015+). https://www.mint.ca/en/bullion/bullion-dna