How to Spot Fake Gold: Protecting Your Bullion Investment from Counterfeits

Gold counterfeiting is a real and persistent threat in the precious metals market. As gold bullion prices have surged in recent years, so too has the incentive for bad actors to produce convincing fakes. Reports of 10 oz. gold bars filled with tungsten — a metal that closely mimics gold’s density at a fraction of the cost — have surfaced among dealers and refiners across the country. Whether you’re a seasoned investor or just beginning to buy gold, knowing how to authenticate your bullion is essential to protecting your wealth.

At Polyak Precious Metals, San Francisco’s trusted bullion dealers with over 40 years of experience, we take authenticity seriously. Every product we sell is verified before it reaches your hands. But we also believe an informed investor is a protected investor — so here’s what you need to know.

6 Ways to Authenticate Gold and Silver Bullion

1. Measure It: Precision Reveals Fakes

Every genuine gold bullion coin or bar is manufactured to exact specifications. Even a deviation of a single millimeter in diameter or thickness can indicate a counterfeit. Before purchasing physical gold, familiarize yourself with the precise dimensions of common products — American Gold Eagles, Canadian Maple Leafs, Krugerrands — and use digital calipers to verify them. This simple step can rule out many obvious fakes.

2. Weigh It: The Most Reliable Test

Weighing your gold bullion is one of the most effective authentication methods available. The vast majority of counterfeits fail this test. A 1 oz. Canadian Maple Leaf, which is .9999 fine gold, should weigh exactly 31.1 grams. A 1 oz. American Gold Eagle, with its 22-karat alloy composition (91.67% gold, 3% silver, 5.33% copper), should weigh approximately 34 grams. A precise digital scale is a small but worthwhile investment for anyone building a precious metals portfolio.

3. Feel and Sound: Trust Your Senses

Genuine gold has a distinctive density and, when dropped on a hard surface, produces a clear, resonant ring. Counterfeits — often made from base metals — tend to produce a dull thud. While this method requires some familiarity with real bullion, it can serve as a quick initial check, especially for coins.

4. The Magnet Test: Gold Is Non-Magnetic

Gold is not attracted to magnets. If you hold a strong rare-earth magnet near your gold bullion and it reacts, the piece almost certainly contains magnetic base metals and is not genuine. This is one of the fastest and least invasive tests available and should be part of any basic authentication routine.

5. The Acid Test: Chemical Verification

A nitric acid test can provide strong evidence of gold purity by applying a small drop to a discreet area of the piece. Genuine gold will not react, while base metals will. This test is best performed by experienced professionals, as it can damage the bullion if done incorrectly. If you’re buying gold in San Francisco and want professional verification, our team at Polyak can assist.

6. Professional Verification: The Gold Standard

For significant investments in physical precious metals, professional verification is the most reliable option. Reputable bullion dealers use X-ray fluorescence (XRF) machines to determine metallic composition with precision, without damaging the piece. If you’re purchasing high-value gold bars or coins, always insist on this level of verification — or buy from a dealer who has already done it for you.

The Safest Way to Buy Gold Bullion: Choose a Trusted Dealer

Knowing how to test gold is valuable, but the most effective protection against counterfeits is purchasing from established, reputable bullion dealers. At Polyak Precious Metals, we source exclusively from recognized mints and refiners, and every product undergoes authentication before sale. We’ve been serving investors in San Francisco and the Bay Area for over four decades — our reputation is built on trust, transparency, and integrity.

Whether you’re looking to buy gold, add silver bullion to your portfolio, or simply want to verify coins you already own, our team is here to help. Visit our San Francisco showroom or reach out to speak with one of our Account Executives today.