A stamp saying “gold” does not by itself prove how much gold an object contains.
When precious metal enters a professional dealing or buy-back process, the desk needs enough evidence to establish the product's identity, weight and metal content.
Standardized bullion may be relatively straightforward to verify, while third-party or non-standard material can require more detailed examination. This is where weighing, verification and assay become important.
Weighing establishes quantity
The first measurement is physical weight.
A dealer can compare the measured weight with the specification expected for the product.
For example, a standardized bullion bar should fall within the applicable manufacturing parameters for its stated format.
Weight alone, however, cannot establish purity.
A one-kilogram object is not automatically one kilogram of fine gold simply because its total mass is one kilogram.
That is why weight must be considered together with fineness.
Fineness determines metal content
Fineness expresses the proportion of precious metal contained within the product.
A gold bar marked 999.9 indicates a very high gold content. A product marked 916.7 contains a different proportion of gold, with the remainder consisting of other metals.
The relationship between weight and fineness determines fine-metal content.
This means accurate valuation requires both pieces of information.
What assay means
Assay is the process of determining or confirming the composition and purity of a material.
The appropriate testing method can vary depending on the metal, product, required level of confidence and whether the item can be tested without altering it.
For educational purposes, the core concept is more important than the individual laboratory method:
assay establishes what the material actually contains.
That information can then support valuation and settlement.
Why standardized bullion can be easier to verify
A standardized bar can arrive with several useful characteristics:
- defined weight;
- stated fineness;
- manufacturer markings;
- serial number where applicable;
- known dimensions;
- established transaction or custody history.
These characteristics create multiple points that can be compared with expected specifications.
A recognized product with a clear chain of custody may therefore require a different verification process from an unknown piece of metal arriving from outside the dealer's system.
Third-party products require independent confidence
When a dealer evaluates a third-party bar or coin, it cannot simply rely on the fact that someone previously described it as genuine.
The desk assumes responsibility for what it buys into inventory.
It therefore needs sufficient confidence in the item's weight, purity and authenticity before completing settlement.
Alloy Capital Commodities states that it weighs, assays and settles qualifying third-party bars, coins and scrap on the bench.
That process reflects a basic principle of physical markets: the asset must be verified before its metal content can be treated as established.
Assay affects value
Suppose an item is represented as high-purity gold but testing establishes lower fine-gold content than expected.
Its value must reflect the actual verified metal rather than the claim made before testing.
The same principle applies to silver, platinum, palladium and mixed precious-metal material.
Verification protects both sides
Assay should not be understood solely as a hurdle imposed on a seller. It gives both parties a factual basis for settlement.
The seller knows which metal content the offer is based on.
The dealer gains confidence that the material purchased corresponds to the value being paid. Physical precious-metal settlement ultimately depends on measurable reality:
What does it weigh, what does it contain, and can those characteristics be verified?
