Assay & Purity · 5 min read
How to Verify Gold Purity
Verification is a sequence rather than a single test. Each stage narrows the range of possibilities, and the later stages are only worth performing once the earlier ones are consistent.
1. Review what is claimed
Start with the stated product: form, weight, fineness and any markings. Check that the claim is internally consistent — that the stated weight, dimensions and fineness fit together.
2. Measure weight and dimensions
Gold is dense. Weight combined with accurate dimensions gives a density figure that is difficult to fake with substituted metals, and inconsistency here is an immediate red flag.
3. Apply non-destructive testing
X-ray fluorescence establishes surface composition quickly; ultrasonic testing helps identify internal inconsistency. Together they screen out most obvious problems.
4. Confirm by assay where required
Where the transaction requires a settlement-grade figure, a laboratory assay on a representative sample provides it. The parties agree beforehand which laboratory and which method applies.
Verification requirements vary by product and by transaction and are established before proceeding.
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