How to Authenticate Gold Coins & Bullion

Measure the gold coin or gold bullion. All gold coins and bullion are made to exact size specifications. If it is off by even a millimeter then it is probably a fake. A 1 pz. gold American Eagle is exactly 32 mm in diameter. A UK Sovereign is exactly 22 mm in diameter. A size chart is provided in the Resources section.

Weigh the gold coin or gold bullion. All gold coins and bullion are made to equal precise weight. If it is even slightly off, then it is probably a fake. A 1-oz. gold American Eagle weighs exactly 1 oz. A UK Sovereign weighs exactly 0.235 oz. A weight chart is provided in the Resources section.

Examine the surfaces of the gold coin or gold bullion. Fake coins are often dull or overly shiny. Their color can be more yellowish than gold. Designs of fake coins often lack detail. This is because they are often cast from molds made from real coins. Compare the gold coin or gold bullion to an item you know to be authentic. If it appears different from the authentic coin, it is probably a fake.

Listen to the sound the gold coin or gold bullion makes when you drop it on a hard surface. A real coin will make a ringing sound; a fake coin will thud. Only perform this test if maintaining the quality of the coin's design is not an issue. Dropping a brilliant uncirculated coin will damage it and reduce its value.

Feel the gold coin or gold bullion. Fakes will often feel slippery, too smooth or have sharp edges. Close your eyes and feel a coin you know is real in one hand and the suspect coin in the other. If they feel different, then one is a fake.