How to Spot a Fake Gold or Silver Coin: 5 Easy Checks

ByBNW Staff
When the US Mint redesigned the American Gold Eagle in 2021, it added anti-counterfeiting features, including a reeded edge variation on the one-ounce coin. Britain’s Royal Mint and Canada’s national mint use lasers, micro-engraving and hidden images in the same way.

Mints take fakes seriously because copies of popular coins and small bars do circulate, especially in private sales. Most of them, though, fail simple tests at home. Reputable sellers publish their own guidance too, as with BTC Mints’ authenticity checks, which cover weight, size, sound and hallmarks.

Here are five checks anyone can run, from the quickest to the most reliable.

1. Weigh and measure against the mint’s own figures

Two inexpensive tools do most of the work: a jeweller’s scale that shows weight to two decimal places of a gram, and a set of digital calipers. Compare every reading with the specifications on the issuing mint’s website, not with a figure from a forum.

The Perth Mint gives its 2026 one-ounce gold Kangaroo a maximum diameter of 32.60 mm and a maximum thickness of 2.95 mm. The Royal Canadian Mint lists 31.11 g as the minimum weight of its one-ounce Maple Leafs. A 22 karat coin weighs more than an ounce: the US Mint lists the one-ounce Gold Eagle at 33.931 g, so a “Gold Eagle” that weighs exactly 31.1 g is a warning sign.

There is one catch. The Royal Society of Chemistry lists the density of tungsten at 19.3 g per cubic centimetre, the same figure it gives for gold. A gold-plated tungsten fake can therefore come close on both weight and size, which is why the other checks matter.

2. Use the ping and magnet tests, but know their limits

Balance a silver coin on a fingertip and tap it gently with another coin. Genuine struck silver gives a clear, high ringing tone that lingers. A short, dull clunk suggests a base metal core.

A strong neodymium magnet is useful in a different way. Gold and silver are not magnetic, so a coin that jumps to the magnet is almost certainly fake. Passing the test proves much less, because copper, lead and tungsten do not stick to a magnet either. Treat both tests as quick screens that catch crude copies, not as final proof.

3. Learn the security features of the coins you buy

Modern bullion coins carry details that are very hard to copy:

  • Royal Mint Britannia: since the 2021 edition, a latent image that switches from a padlock to a trident as the coin tilts, laser-made micro-text reading DECUS ET TUTAMEN, background waves that appear to move, and fine heraldic shading lines on the Union flag of Britannia’s shield.
  • Royal Canadian Mint Maple Leaf: radial lines machined to within microns, plus a small textured maple leaf micro-engraved by laser on the reverse.
  • Perth Mint Kangaroo: a micro-laser engraved letter on the reverse that can only be seen under magnification.
  • US Mint Gold Eagle: the edge reeding variation introduced on the redesigned one-ounce coin in 2021.

The Royal Canadian Mint goes a step further with Bullion DNA. Each die is laser-marked, images are registered in an encrypted database, and approved dealers can scan a coin with a reader to confirm it. The system covers Gold Maple Leafs dated 2014 and later and Silver Maple Leafs dated 2015 and later.

4. For bars, keep the sealed card and its serial number

Small bars are a common target for copies, since a plain design is easier to imitate than a detailed coin. The packaging is your best protection. The Perth Mint ships its one-ounce minted gold bar in tamper-evident packaging with a serial number, and the word VOID appears around the edge of the blister if the card has been prised open.

Some refiners now add a digital layer. PAMP’s VERISCAN system, which gained LBMA accreditation in March 2023, records the unique surface profile of each registered bar. A buyer can scan a bar with a phone app, even inside its sealed assay card, and the scan is matched against the refiner’s production records.

Leave bars in their cards, keep the certificate with them and check that the serial number on the card matches any paperwork.

5. Buy from dealers that source from mints and refiners

Sourcing is the simplest defence. The US Mint does not sell its bullion coins directly to the public. It distributes them through a network of official distributors called Authorized Purchasers. Large bars come from refiners on the LBMA Good Delivery list, which are subject to ongoing testing under the LBMA’s Proactive Monitoring Programme.

Ask any dealer where its stock comes from, and walk away from prices that sit below the value of the metal itself. Established names such as the Royal Mint, APMEX and JM Bullion explain their sourcing openly. BTC Mints says it buys only from authorised mints and LBMA Good Delivery refiners, ships each order with a certificate of authenticity and offers a full refund, including return shipping, on any item found not to be genuine. Its range of 1 oz silver coins from BTC Mints lists the mint and year on each piece, so you know which specifications to check on arrival.

Final thoughts

No single test catches every fake. A scale and calipers rule out most copies, the ping and magnet tests add a quick second opinion, and mint security features or sealed packaging confirm the rest. The surest protection, though, comes before you pay: buy recognised coins and bars from a seller that can show where its metal came from.