Verifying assay certificates
- Match the serial number on the certificate to the number stamped on the bar itself — not to the packaging or invoice.
- Confirm the refiner appears on the LBMA Good Delivery list and that the certificate states weight, fineness and cast date.
- Cross-check the certificate directly with the refiner's own verification service; never rely on a scan supplied by the seller.
- Sealed assay cards should be intact. A re-sealed or re-laminated card is treated as unverified until independently re-assayed.