What is a Hallmark?

When you present an item to a jeweler for inspection or repair, the first thing they will do is flip it over to search for a hallmark. Why? Because a wealth of knowledge can be learned from these small marks imprinted on your jewelry!

A hallmark is an official stamp found on precious metal items that indicates the composition of the metal and its purity. Hallmarks may also include valuable information about the jewelry’s manufacturer and origin.

There are two types of marks commonly found on jewelry:

  • a hallmark indicates the type of precious metal and its purity
  • a makers mark is a symbol or initials that indicate the maker or origin of the jewelry

In order for a stamp to be a true hallmark, it must contain the purity stamp. A makers mark alone is not considered a hallmark.


Hallmarks, often called quality marks or purity marks, are a shorthand for the type of precious metal that makes up the piece. This stamp can be applied by the by the maker or an assay’s office and guarantees the minimum precious metal content present in the jewelry.

Below are a few common purity marks found on precious metal jewelry in the United States:

10K 10 karat gold 41.6% gold, 58.4% alloy
14K 14 karat gold 58.5% gold, 41.5% alloy
585 14 karat gold 58.5% gold, 41.5% alloy
18K 18 karat gold 75% gold, 25% alloy
750 18 karat gold 75% gold, 25% alloy
22K 22 karat Gold 91.6% Gold, 8.4% alloy
24K 24 karat gold 100% Gold
950PD palladium 95% palladium, 5% alloy
950PT platinum 95% platinum, 5% alloy
PLAT platinum 95% platinum, 5% alloy
STER sterling silver 92.5% silver, 7.5% alloy
925 sterling silver 92.5% silver, 7.5% alloy



The look of each maker's mark will be unique to the artist who made it. Often the mark will be the company’s logo or the initials of the artist.

The makers mark for Corey Egan jewelry is composed of my initials, “CE”


Examples of Maker Marks

Tracing a symbol back to it’s maker can be tricky. Some countries, including the United States, do not require the manufacturer to register their maker’s marks. But for antique jewelry and jewelry created abroad, many marks are registered and can be found through search.

Here are some great places to start researching your makers marks:



By stamping a piece of jewelry with its purity and makers mark, the maker assumes responsibility for the accuracy of its contents. The hallmark offers a level of assurance and protection for the consumer, as well as a helpful guide for any jeweler down the line who may need to sell or repair the jewelry.



The requirements for hallmarking jewelry vary from country to country.

European countries often have a more rigorous standard for marking their precious metal goods. In many places an item is not legal for sale without the presence of a hallmark. In United Kingdom an additional stamp on each piece is required from the assay’s office making it legal for sale. This third party tests each piece of jewelry before applying it’s own stamp as a guarantee.

In the United States, makers are not required to stamp their jewelry. But it sure is a good practice to do so!

While not every piece of jewelry will have a hallmark, their presence is helpful for appraisers, jewelers, and for the consumer's peace of mind. Next time you put on your favorite necklace or ring, take a moment to read it’s hallmarks. You’ll be surprised what you can learn!



What is a Hallmark? | Corey Egan




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