In Part 1, we covered some of the most common visual signs that a gold coin or precious-metal item may be counterfeit. But convincing fakes can look surprisingly authentic. In Part 2, we’ll go beyond appearance and look at the physical measurements professionals use—including weight, dimensions, balance, and density—to compare a suspicious coin against official mint specifications and uncover counterfeits that are harder to spot by eye alone.

Common Signals include


● slightly underweight
● too thick
● incorrectly sized
● unevenly balanced
Professional dealers use:
● precision scales
● digital calipers
● density calculations
to compare items against official mint specifications.

Additional signs


● slightly underweight
● too thick
● incorrectly sized
● unevenly balanced
Professional dealers use:
● precision scales
● digital calipers
● density calculations
to compare items against official mint specifications.

Weight Can Reveal a Fake

Counterfeit coins may be slightly underweight compared with genuine examples. Even a small difference can be significant because official coins are manufactured to very specific weight standards.

Picture idea: Coin sitting on a precision digital scale, with the measured weight compared against the official mint specification.

Check the Coin’s Dimensions

Fake coins can be:

  • too thick
  • incorrectly sized

Counterfeiters sometimes compensate for using a metal with the wrong density by changing the thickness or diameter of the coin.

Picture idea: Digital calipers measuring a coin, perhaps with a genuine and counterfeit coin shown side-by-side.

Balance and Construction

A counterfeit coin may also be unevenly balanced because of inconsistent thickness, poor casting, or uneven distribution of material.

Picture idea: Coin balanced horizontally on a small central point, with one side visibly dipping downward.

How Professionals Measure Coins

Professional dealers use:

  • precision scales
  • digital calipers
  • density calculations

These measurements can then be compared with official mint specifications for the coin being examined. Weight, dimensions, and density together can reveal discrepancies that are difficult to spot visually.

If you’re still unsure whether a gold coin, piece of jewelry, or other precious-metal item is genuine, professional testing can provide a much clearer answer. American Rare Coin & Gold offers free appraisals and professional evaluation of gold, silver, coins, jewelry, and other valuables, helping you understand exactly what you have before you decide whether to keep, sell, or add it to your collection.

American Rare Coin & Gold

After many years of appraising gold, jewelry, diamonds and coins, I've learned a lot about what people find most important. Most significant by far is trust. You have my personal assurance that there is absolutely no compromising when it comes to honesty.
Olympia Phone:
360-489-1804
Hours:

Monday: 9AM-6PM

Tuesday: 9AM-6PM

Wednesday: 9AM-6PM

Thursday: 9AM-6PM

Friday: 9AM-6PM

Saturday: 11AM- 4PM

Closed Sundays & Holidays

Address:
1025 Black Lake Blvd SW, Olympia, Washington 98502

Coin Shop in Washington
Sequim Phone:
360-477-4507
Hours:
10am to 5pm
Closed Fridays, Sundays, & Holidays

Address:
338 W Washington St, Sequim, Washington 98382

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