Start with the right question
A gold assay estimates composition in a tested sample; it does not, by itself, prove ownership, legality or the composition of an untested lot. The material form and the commercial question determine what kind of sampling and testing should be considered.
Make the sample traceable
Agree who witnesses the weighing and sampling, the number and identity of samples, how they are sealed, and who holds each one. Keep records that connect the sample to the lot. If the material is mixed or irregular, ask a qualified testing provider how a representative sample can be obtained before relying on a result.
Choose a suitable independent pathway
Different methods can answer different questions. Ask the proposed laboratory or assessor to describe its method, limitations, reporting format and any accreditation relevant to the work. Agree in advance whether an independent referee test is needed if reported results conflict.
Connect the result to the transaction
Record weights, composition, dates, sample IDs and the agreed commercial interpretation in documents both parties can review. Goldcrest can discuss assessment questions raised by an enquiry and the parties who would need to be involved. Testing availability and any specialist appointment must be confirmed for each case.