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Compliance

HUID and Hallmarking: What Jewellers Need to Know

5 min read · Updated 2026-08-21

Hallmarking certifies the purity of gold jewellery, and the HUID is a unique identifier tied to a hallmarked item. Jewellers should understand both and record the HUID where applicable on sales.

What hallmarking certifies

A hallmark is an official mark indicating that a piece has been assessed for purity. It gives customers confidence that the caratage they are paying for is genuine.

What the HUID is

The HUID, or Hallmark Unique Identification, is an alphanumeric code assigned to a hallmarked item. Recording it against the item on a sale keeps your records aligned with the physical stock and helps with traceability.

Recording HUID on invoices

Where an item carries a HUID, capturing it on the invoice and in your inventory record is good practice. Rules and requirements evolve, so keep an eye on the latest guidance from the relevant authorities.

Frequently asked questions

What is HUID in gold?

HUID stands for Hallmark Unique Identification, an alphanumeric code assigned to a hallmarked gold item to identify it uniquely.

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