Why we hallmark all our diamond earrings and earring jackets.

Regardless of their weight, we send all our solitaire diamond earrings, diamond earring jackets and bespoke diamond jewellery to the oldest UK assay office, Goldsmiths' Company in London to be hallmarked.

Just as a GIA Diamond Dossier guarantees the quality of our diamonds, hallmarking offers the same peace of mind for the gold and platinum used in our settings.

When jewellery has been hallmarked, you are assured:

  • The article has been independently tested
  • It conforms to all legal standards of purity (fineness)
  • The provenance is guaranteed by detailing, as a minimum legal requirement, where the piece was hallmarked, what the article is made from, and who sent the article for hallmarking. 

A hallmark consists of a series of marks applied to articles containing precious metals. Our pieces feature a minimum of three marks:

Sponsors' Mark (also known as makers' mark).

The registered mark of the company that submitted the article for hallmarking. Our double H can be found within a round shield.

Millesimal Fineness Mark 

This mark indicates how fine, or what quality, the metal is, as well as detailing the metal type. The shape of the shield indicates the metal type, while the number shows the precious metal content as parts per thousand.

Assay Office Mark

There are four Assay Offices in the United Kingdom. This mark tells you which office tested and hallmarked the article. All our pieces bear the historic leopard’s head - the town mark for London, and the mark of the Goldsmiths’ Company Assay Office.

More information on the importance of hallmarking can be found on the Goldsmiths' Company Assay Office website. We also encourage you to download this PDF from the British Hallmarking Council outlining the legal requirements of hallmarking.