How to Spot Fake Gold and Silver
The most reliable defense against fake gold and silver is buying from established sellers, then checking what you receive against published specifications. Weight and dimension checks catch many crude fakes, magnet and ping tests add quick clues, and electronic verifiers can detect sophisticated counterfeits such as tungsten-filled bars. No single home test is conclusive on its own.
Why Counterfeits Exist
Counterfeit coins and bars have become more common as online marketplaces make it easy to sell anonymously. Many fakes are copies of popular bullion coins made from base metals with a thin gold or silver plating. More sophisticated versions use tungsten, whose density is close to gold's, so a fake can weigh nearly the right amount. Counterfeit certified holders and assay cards also circulate.
Step 1: Know the Specifications
Every sovereign mint publishes exact weight, diameter and thickness for its bullion coins. Before testing anything, look up the official figures from the issuer, such as the U.S. Mint, Royal Canadian Mint or The Royal Mint. For example, a one-ounce American Gold Eagle weighs about 33.93 grams because it is 22-karat alloy, while a one-ounce .9999 Gold Maple Leaf weighs about 31.1 grams. Our guides to gold coin sizes and weights and gold purity list common figures.
Step 2: Weigh and Measure
A digital scale accurate to 0.01 gram and a set of digital calipers are the two most useful tools a buyer can own.
- Weight: genuine bullion should match the published weight within a very small tolerance. A coin that is noticeably light or heavy is a red flag.
- Diameter and thickness: base metals are less dense than gold, so a fake with the right weight is usually too thick or too wide.
The weakness of this test is tungsten. Its density is about 19.25 grams per cubic centimeter, very close to gold's roughly 19.32, so a well-made tungsten-core bar can pass weight and dimension checks. That's why the next steps matter.
Step 3: Quick Physical Checks
Magnet test
Gold, silver and platinum are not magnetic. If a strong neodymium magnet grabs a coin, it likely contains iron, nickel or steel. A non-magnetic result proves little, since copper, lead, zinc and tungsten aren't magnetic either. Silver's strong conductivity makes a magnet slide slowly down an angled silver bar, a useful supplementary clue.
Ping test
Balanced on a fingertip and tapped gently with another coin, genuine silver and gold coins produce a clear, sustained ring. Base-metal fakes tend to produce a dull, short sound. Smartphone apps can compare the frequency to known samples. Results vary with coin size and capsules, so treat this as a screening tool.
Visual inspection
Compare details against a known genuine piece or high-resolution images from the mint: lettering, edge reeding, design sharpness and luster. Several mints have added security features, such as fine radial lines and micro-engraved marks on the Royal Canadian Mint's Maple Leafs and anti-counterfeiting elements on recent Royal Mint Britannias. Each mint describes its own features on its website.
Step 4: Electronic and Professional Testing
- Resistivity verifiers (such as the Sigma Metalytics devices widely used by coin shops) measure electrical properties below the surface and can often detect tungsten or base-metal cores without damaging the item, sometimes even through a plastic capsule.
- Ultrasonic thickness gauges look for internal inclusions in bars.
- X-ray fluorescence (XRF) analyzers read surface composition precisely but don't see deep into a bar.
- Acid tests scratch the surface and are destructive, so they're mostly used for scrap and jewelry rather than bullion.
Many local coin shops will verify a piece for a modest charge or at no cost. If you are selling, the buyer will test anyway.
Checking Certified Coins and Assay Cards
Graded coins sealed in plastic holders by services such as PCGS and NGC carry a certification number. Both services offer online lookups where you can enter the number and compare the recorded coin and images with what you hold. A mismatch is a serious warning sign. See our guide to coin grading for how certification works. For minted bars sold in assay cards, check the serial number on the bar against the card and, where the refiner offers it, against its verification system.
Step 5: Buy From Sources You Can Verify
Testing catches fakes after the fact. Choosing the seller prevents most of them. Warning signs include prices well below the spot value of the metal, sellers who won't provide a business address, and payment requests by gift card, wire to an individual, or cryptocurrency only. The Commodity Futures Trading Commission publishes consumer warnings on precious metals fraud, summarized in our page on what the CFTC warns about. Our guide on how to verify a precious metals dealer covers background checks.
Established sellers typically source from mints and recognized distributors; it's reasonable to ask any seller where its products come from. Goldco is a precious metals company, and metals purchased for IRAs through it are held at an independent insured depository rather than shipped to the account owner. Our page on how to check whether Goldco is legitimate walks through the steps you can take yourself.
If You Think You Bought a Fake
- Stop using or reselling the item.
- Get a second opinion from a reputable coin shop or assay service.
- Contact the seller in writing and keep all records.
- Report fraud to the FTC at ReportFraud.ftc.gov and, for marketplace purchases, to the platform.
Frequently Asked Questions
Does a magnet test prove gold is real?
No. It can rule out iron and steel cores, but many counterfeit materials, including tungsten, are also non-magnetic.
Can tungsten-filled gold bars be detected at home?
Not reliably with a scale alone. Electronic resistivity verifiers or professional testing are better suited to finding them.
Are fakes common among sovereign bullion coins?
Counterfeits of popular coins exist, which is why mints have added security features. Buying from established sources sharply reduces the chance of encountering one.
Is a slabbed coin always genuine?
Not necessarily. Counterfeit holders exist, so verify the certification number with the grading service.