All precious metal products are described as liquid, but the speed and cost of selling them varies enormously. The form the metal takes determines who can buy it.
Liquidity is depth as well as speed
A liquid holding can be sold quickly, in size, without moving the price far against the seller. All three conditions have to hold for the description to mean anything.
Many products satisfy the first condition and fail the others. A dealer will buy almost anything immediately, but the price offered reflects how hard the item will be to resell.
The useful test is not whether a buyer exists but how many buyers exist and how quickly the next one can be found.
Accredited bars sit at the liquid end
Large bars from accredited refiners, held in recognised vaults with unbroken custody records, can move between professional counterparties with minimal verification.
That acceptance is what makes them cheap to trade: no assay, no dispute about origin, and a wide set of institutions willing to take them.
Once such a bar leaves the recognised chain of storage, it has to be re-verified before re-entering, which introduces cost and delay.
Retail coins trade widely but at a premium
Widely produced bullion coins are recognised by dealers everywhere, so a seller has many possible counterparties and rarely waits long.
Their prices carry a fabrication premium in both directions, which makes the round trip more expensive than trading large bars even though the sale itself is easy.
In periods of heavy retail demand, that premium can widen substantially, benefiting sellers of exactly the products that cost most to buy.
Collectable pieces depend on a narrower market
Coins valued for rarity or condition rather than metal content are priced by a specialist market with fewer participants.
Selling into that market can take time and often involves an intermediary, an auction or a grading process before a fair price is available.
The metal content sets a floor, but realising anything above that floor requires finding the particular buyer who values the particular piece.
Silver adds a physical constraint
A given value in silver occupies far more space and weight than the same value in gold, which affects storage, shipping and dealer handling.
Large silver positions can therefore be slower and costlier to move, especially where transport and insurance are priced by bulk rather than by value.
The metal trades actively, but the practical liquidity of a physical silver holding is not the same as the liquidity of the silver price.