Authentication

COA vs. LOA: Understanding Authentication Paperwork

Not all certificates are created equal. Here is how to read them.

Aug 14, 2026·4 min read

A certificate of authenticity (COA) is a statement from the issuer that the item is genuine. Its value depends entirely on the reputation of the issuer.

A letter of authenticity (LOA) from a recognised third-party authenticator is typically more detailed and carries more weight in the market.

Tamper-evident holograms matched to a database record provide an extra layer of traceability. Always verify certificate numbers with the issuer.

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