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Hallmarking - What is a hallmark?

28 Feb 2021
Ring metal hallmarking

A Hallmark is a small marking that is stamped onto a precious metal to guarantee that it conforms to standards of purity and has been independently tested.

It is impossible to verify the precious metal content of a piece of jewellery by merely looking at it by sight or by touch. It is therefore a legal requirement that items made from platinum, gold, palladium or silver much be independently tested and then hallmarked in order to be described as such.

Fineness of Our Metals

18k Gold (750)

18 Karat Gold Hallmarking

75% Pure

9k Gold (375)

9 Karat Gold Hallmarking

37.5% Pure

Platinum (950)

Platinum Hallmarking

95% Pure

Palladium (950)

Palladium Hallmarking

95% Pure

All Purely Diamonds rings and jewellery are hallmarked at British Assay offices ensuring our precious metal jewellery is compliant with the UK’s hallmarking regulations. All items are subject to an internal confirmation process to ensure they meet the UK’s hallmarking regulations before they are dispatched to our customers.

We are an Assay Assured Jewellery Retailer. Assay Assured status is only given to retailers who have been independently audited and verified by Assay Assured which is run and overseen by the Edinburgh Assay Office, and ensures that all precious metal jewellery (except items exempt by weight) are independently tested and hallmarked.

Here is what to expect to see inside your Purely Diamonds jewellery

Sponsor's Mark Fineness Mark Assay Office Mark
Gold Platinum Palladium
Purely Diamonds Hallmark Sponsors Mark
The sponsor's mark for Purely Diamonds is "ST" after our creative director, Stephen Tyler.
9 Karat Gold Hallmarking Platinum Hallmarking Palladium Hallmarking London Assay Office Mark
Birmingham Assay Office Mark
18 Karat Gold Hallmarking Sheffield Assay Office Mark
Edinburgh Assay Office Mark

These are the additional marks that may appear

Traditional Fineness Mark
Gold Platinum Palladium
Gold Traditional Fineness Mark Platinum Traditional Fineness Mark Palladium Traditional Fineness Mark
Date Letter
2017 2018 2019
Assay Year Mark - 2017 Assay Year Mark - 2018 Assay Year Mark - 2019

Marks Explained

Sponsor's Mark
The registered mark of the article for hallmarking

Fineness Mark
Tells you the precious metal content expressed in parts per thousand

Assay Office Mark
Tells you which Assay Office tested and hallmarked the article

For full information regarding hallmark options visit the Assay Office website.

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