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Would you like to know if your gold coin is genuine? In this article, we explain how you can test the authenticity of your gold coins yourself using simple methods such as weighing, sound, specific gravity, color, and security features. This helps you avoid buying or keeping a counterfeit coin.
At Holland Gold, we offer two types of coins: gold investment coins and historic gold coins. Historic coins can be centuries old, as can their counterfeits. Modern bullion coins originated in 1967 with the introduction of the Gold Krugerrand in South Africa. Since then, many globally recognized coins have been introduced. We only sell coins from accredited mints that meet all quality standards, and we carefully verify each coin’s authenticity before resale.
Use a precise, calibrated scale. The coin’s weight must match the official product specifications exactly. Take packaging into account. Any deviation may indicate another metal or a counterfeit coin. Check the product page for the correct weight. Note: kitchen scales are not accurate enough for this purpose.
Check the coin’s dimensions and weight. These must match the manufacturer’s specifications. If you know the composition (e.g., 100% gold), you can calculate the specific gravity using the formula: P = M / V, where P is density, M is mass (grams), and V is volume (cm³).
Gold has a specific gravity of 19.32 g/cm³. Silver, for example, is less dense (10.49 g/cm³), meaning a silver coin is larger than a gold coin of the same weight. If a coin is made with a silver core and a thin gold layer, its diameter will be noticeably larger.
Note: tungsten has nearly the same specific gravity as gold, making it the hardest counterfeit to detect. Therefore, always also perform the sound test or, as a last resort, the cut test.
Tap the coin gently with another coin or a metal rod. A genuine gold coin produces a high, clear tone with resonance. A dull or short sound may indicate a different metal core, such as tungsten. You can also drop the coin carefully onto a wooden surface to assess the sound.
Coins containing a small amount of copper, such as the American Eagle, Krugerrand, Dutch Ten Guilder, and British Sovereign, often have an even more distinct tone due to the copper content.
Compare the color of the coin with another of the same type. Most bullion coins are 24 karat (99.99%) gold and have a deep golden shine. Historic coins often contain copper, giving them a slightly reddish or less glossy appearance. Older investment coins may also appear duller than newly minted ones.
Many modern gold coins include advanced security features. For instance, since 2015, the Maple Leaf has featured a micro-engraved maple leaf with the year, visible under magnification. Check the product specifications for your coin’s security features.
We do not recommend this test as it permanently damages the coin. If you still have doubts after other tests, you can gently press the coin with pliers. Pure gold is relatively soft and will show a clear indentation. A tungsten core, however, will not. Note: this test is less effective for copper-containing coins like the Krugerrand or historical coins, and any damage will reduce the coin’s resale value.
We understand that testing your gold coins yourself can be challenging. At Holland Gold, we are happy to assist you. When you collect your precious metals from us, we can perform a professional authenticity test together using our advanced X-ray and magnetic testing equipment. This way, you can be certain your gold is genuine and authentic.
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