Hallmarking

Hallmarking a ring with the London Assay Office certifies its metal purity and authenticity, ensuring it meets UK legal standards. As one of the world’s oldest and most respected institutions, the London Assay Office has provided this assurance since 1327, adding value and credibility to the jewelry while protecting consumers from fraud.

The Hallmarking Process

Metal Testing: The first step is to determine the metal's purity. The ring is carefully tested to ascertain whether it meets the legal standards for its stated precious metal content. This is done using methods such as X-ray fluorescence (XRF) or fire assay for gold, ensuring accuracy in the results.

Hallmarking: Once the metal's purity is confirmed, the ring is marked with a hallmark. This hallmark consists of several distinct symbols:

• Sponsor's Mark: This identifies the maker or the company that submitted the piece for hallmarking.
• Standard Mark: Indicates the fineness or purity of the metal. For example, 925 for sterling silver, 375 for 9-carat gold, or 950 for platinum.
• Assay Office Mark: The London Assay Office’s mark is a leopard’s head, symbolizing that the item was tested and certified in London.
• Date Letter: A letter indicating the year the item was hallmarked, allowing for historical reference.

Click here the Assay Office Dealer's Notice for more info.