Bullion buyer center
How to verify bullion weight and purity
Use published specifications, dimensions, density, magnet response, provenance, and professional testing as layered checks.
What changed
The verification workflow now emphasizes multiple non-destructive tests and clear stop conditions before a purchase is accepted.
Why it matters
Counterfeits can match one characteristic while failing another. Packaging can also prevent reliable measurement, so the testing plan should be agreed before purchase.
- Use a calibrated scale and caliper.
- Compare exact product specifications.
- Treat magnets as screening, not proof.
- Use XRF, ultrasound, or specific-gravity expertise when value warrants.
Historical context
Precious-metals markets mix a globally traded raw material, manufactured investment products, and retail distribution. The price of the metal and the price a buyer actually pays can therefore diverge for long periods.
What could change the conclusion
Some legitimate products vary within published tolerances, and surface testing may miss a plated or filled interior. Professional judgment still has limits.
Reproducible by design
Methodology and limitations
- Start with provenance and seller remedies.
- Compare several independent physical properties.
- Document results and preserve chain of custody.
Educational information only. GoldKnows does not provide individualized investment, tax, legal, appraisal, custody, or trading advice.
Evidence ledger