What Is a Troy Ounce?

Across the lengthy history of coins, precious metals, and monetary systems, there have been numerous ways to weigh and measure coins. One of the oldest units of measurement is known as the troy ounce, which is still in use in some circles today.

What Is a Troy Ounce?

Troy Ounce | French Coins | Atlanta Gold And Coin

It is a medieval unit of measurement that was named after its origins: Troyes, France. It has long been used to measure precious metals. This practice was first adopted by the British Empire in 1527 and has been in use in the U.S. since 1828.

What Is a Regular Ounce?

When people refer to an ounce, they often mean the avoirdupois ounce, which is 1/16 of a pound. Avoirdupois is the name of the system of weights used in the U.S. and some other English-speaking countries.

What’s the Size of a Troy Ounce vs. an Ounce?

  • A troy ounce is 31.1 grams
  • A regular ounce is 28.3 grams

History of the Troy Ounce

Although it is known that it got its name from Troyes, France, it is less clear where the unit of measurement originated. Many believe that it began to be commonly used during Roman times, as the Romans made great strides to standardize monetary systems. Among these systems, Romans used bronze bars that were made of 12 individual “unicas,” and each piece weighed around 31.1 grams, similar to it. Therefore, historians believe that merchants of Troyes modeled their monetary system using similar weights to the Romans.

Using the Troy Ounce Today

In general, these are used in lieu of common ounces when it comes to buying and selling gold, silver, and other precious metals. It’s important to be familiar with this unit of measurement as some sellers will try to boost the apparent value of their products by listing them in ounces. For example, buyers could purchase 100 ounces of gold bullion and lose 10 percent of the value of their purchase, as it only weighs 90 troy ounces.

Troy Ounce Coins

Not all these coins weigh exactly one troy ounce or 31.1 grams. For example, two of the most popular gold coins in the industry are American gold eagles and South African gold krugerrands. These coins are 22k and are composed of gold and base metals for durability purposes. While they contain exactly one troy ounce of fine gold, the additional base metals used in the production of these coins brings the total weight to 33.93 grams.

Troy ounces are one of several basic terms to be familiar with as a buyer or seller of precious metals or coins. For more information about the process or to learn more about our products, view our current inventory online or call 404-236-9744 to request an appointment with Atlanta Gold & Coin Buyers.

Tony Davis
Tony Davis