How to Verify a Gold Bar Is Authentic

How to Verify a Gold Bar Is Authentic

Buying physical gold means trusting that the bar you receive matches its stated weight and purity. Every gold bar in this collection ships with a certificate of authenticity and carries markings that let you verify those claims yourself, rather than taking a seller's word alone.

What a Genuine Gold Bar Should Show

  • Stamped weight: the exact gram or ounce figure struck into the bar itself, not just printed on packaging.
  • Stamped purity: .999 fine or higher, stamped alongside the weight.
  • Refiner mark: a hallmark or logo identifying the refiner that produced the bar.
  • Serial number: on most bars 10 grams and above, allowing the bar to be tied to its certificate.
  • Certificate of authenticity: a separate document confirming weight, purity, and refiner, matched to the bar's serial number where applicable.

Why Refiner Reputation Matters

A bar's authenticity claim is only as strong as the refiner behind it. Refiners accredited by the London Bullion Market Association meet established assay and production standards, which is why sourcing from LBMA approved refiners is a meaningful signal, separate from the individual bar's own serial number and stamp.

What Buyers Can Check Before and After Purchase

Before buying, confirm the listing states the refiner by name rather than only "LBMA approved," since that lets you verify the refiner's accreditation independently. After receiving a bar, confirm the stamped weight and purity match the listing, and keep the certificate of authenticity with the bar rather than storing them separately, since a bar without its matching certificate is harder to resell at full value later.

What This Does Not Replace

A certificate of authenticity from the point of sale is not the same as an independent third party assay. Buyers planning to resell a bar to a different dealer, or allocating a large sum, should ask whether that dealer requires independent assay regardless of the original certificate, since resale standards vary by buyer.

Frequently Asked Questions

Does every gold bar have a serial number?

Most bars 10 grams and above carry a serial number. Smaller bars sometimes do not, depending on the refiner.

Is a certificate of authenticity the same as an assay certificate?

No. A certificate of authenticity confirms weight, purity, and refiner at the point of sale. An assay certificate involves independent third party testing, which is a separate and more rigorous process.

What should I do if a bar's stamp does not match its certificate?

Contact the seller immediately and do not resell or melt the bar until the discrepancy is resolved.

Does LBMA accreditation apply to the specific bar I am buying?

LBMA accreditation applies to the refiner's standards and production process, not a designation stamped onto every individual retail bar that refiner produces.