Your Guide to Hallmarking

Your Guide to Hallmarking

Explore the intricate world of jewellery hallmarking and discover its crucial role in certifying the authenticity and quality of your ring.

Before delving into the realm of engagement ring selection, it's important to grasp the significance of hallmarking. In the UK, this is not just a formality; it serves as your legal guarantee that the piece you buy is genuine. 

Mandatory Hallmarking

Dating back to the 1300s, the evolution of hallmarking laws has resulted in stringent criteria for mandatory application. Presently, any item surpassing specific metal weights necessitates the presence of a hallmark. This includes:

  • Exceeding 7.78 grams of silver
  • Surpassing 1 gram of 18ct gold or palladium
  • Crossing the threshold of 0.5 grams of platinum

Practically, this implies that articles with minimal metal content may be exempt from mandatory hallmarking. For instance, a white gold ring with a platinum setting may forego the platinum hallmark. Furthermore, gold-plated articles falling below the stipulated weight are exempt from gold hallmarks.

A full UK hallmark tells you:

  1. Who submitted the article for hallmarking (sponsor’s mark)
  2. What the final metal is made of (Metal fineness mark)
  3. Where the article was hallmarked (Assay office town mark)
  4. When the article was hallmarked (date letter) is optional

What do the symbols of the Full UK Hallmark represent?

Sponsor's Mark

The Sponsor's Mark, also known as the Maker's Mark, is a cornerstone of hallmarking, representing the unique identifier of the individual or company that submits an item for hallmarking. This mark ensures traceability back to the creator, fostering accountability and integrity within the precious metals industry. Each mark is distinct, encapsulating the heritage and legacy of its maker within a shield-shaped emblem that contains the chosen initials, linking present craftsmanship with a rich history that spans centuries.


LAO stands for London Assay Office

Traditional Fineness Symbol

The Traditional Fineness Symbol, while optional, plays a significant role in hallmarking, particularly in the UK where it's a standard feature at the Goldsmiths' Company Assay Office. These symbols, ranging from the iconic sterling silver to the prestigious platinum, serve not just as marks of quality but as emblems of the rich heritage and rigorous standards upheld by the British hallmarking tradition, bridging the past with the present through symbols of timeless value.

Left to right: Sterling silver, Britannia silver, gold, palladium, platinum

Millesimal Fineness Mark

The Millesimal Fineness Mark is a testament to the purity of a precious metal item, denoting its quality in parts per thousand. Introduced as a compulsory element in 1999, this mark guarantees the minimum standard of precious metal content, offering clarity and confidence to consumers. It encapsulates the essence of hallmarking: the assurance of quality and purity, providing a clear, numerical indication of an item's precious metal content.

Assay Office Mark

The Assay Office Mark signifies the specific Assay Office responsible for testing and hallmarking the precious metal item. Each mark, such as the historic leopard's head for London, not only denotes the testing location but also carries with it a legacy of quality and trust. These marks are a seal of approval from some of the oldest institutions in the hallmarking world, linking every item to a tradition of excellence.

Left to right: London, Birmingham, Sheffield, Edinburgh 

Date Letter Mark

The Date Letter Mark offers a window into the past, providing a chronological record of when an item was hallmarked. With its annual change, this mark captures a moment in time, offering both collectors and enthusiasts the ability to trace the history of their cherished items. Though non-compulsory, the inclusion of a date letter adds a layer of depth and historical context to the hallmarking narrative.

Date Letters: 2019-2024

For more information, visit the Goldsmiths' Company Assay Office website. This is the institution in charge of all hallmarking in the UK.


Should a ring have a hallmark?

A ring should have a hallmark as it certifies the metal's purity, ensuring that it meets legal standards. In the UK, hallmarking is a legal requirement for precious metals, with specific exemptions based on the weight of the item​.

Why is hallmark important in jewellery?

Hallmarks are crucial in jewellery to guarantee the quality and authenticity of the metal used. They provide a traceable link back to the maker and assure the consumer of the item's value and composition​.

What does a hallmark tell you?

A hallmark on a piece of jewellery, including rings, tells you the type of metal, its purity, the assay office where it was tested, and often the maker's mark. This information helps in verifying the quality and authenticity of the piece​.

What does it mean if a ring has no hallmark?

If a ring has no hallmark, it might mean it does not meet the legal standards for precious metal purity, or it could be an older piece made before hallmarking regulations were strictly enforced. In such cases, the ring's value and authenticity might be harder to determine without expert evaluation​.

Two white models standing in a street, wearing bespoke bridal jewellery

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