Understanding the difference between spot price, physical bullion premiums and the buy-back price
When investors look at the gold price, they often see a single number quoted as the spot price.
But if you actually buy or sell physical gold, you quickly discover that there is more than one price.
There is the international spot price of the metal, the price a dealer charges for a physical bar or coin, and the price the dealer is prepared to pay when you sell that physical bullion back.
The difference between these prices is the physical bullion spread.
Understanding that spread is essential for anyone accumulating physical gold or silver.
It also becomes particularly important when physical bullion demand rises and available stock becomes harder to source.
Spot gold is not the price of a physical bar
The international spot market provides a benchmark for the underlying value of gold.
Physical bullion, however, has additional costs attached to it.
A physical bar or coin has to be manufactured, refined, assayed, packaged, transported, insured, stored and distributed. Dealers also need to manage inventory, financing, hedging and market risk.
The price of a physical product therefore normally consists of:
Spot price + physical premium + applicable costs and margin = retail physical bullion price
When you sell that bullion, the calculation works differently.
The dealer is effectively buying the metal from you at a price based on the prevailing market and the value of that particular product.
Spot price − applicable buy-back adjustment = physical bullion buy-back price
The difference between what you paid and what you can immediately sell it for is the spread.
This is a normal feature of physical markets rather than an indication that the underlying metal has suddenly lost value.
The size of the bullion matters
One of the most important factors many new investors overlook is the size of the bar or coin.
A small gold bar contains the same fundamental metal as a larger bar, but it generally costs more per gram or per ounce to manufacture and distribute.
Why?
The manufacturing cost of producing a 1 oz gold bar is not necessarily ten times the cost of producing a 10 oz gold bar.
Larger bars generally benefit from economies of scale, meaning the manufacturing and minting cost per ounce can be significantly lower.
Packaging, refining, minting, assaying, handling and distribution costs are spread across different quantities of metal.
This means smaller products can carry a higher premium over spot.
Larger bars can often be produced and traded more efficiently on a per-ounce basis.
The same principle can apply when selling.
A highly liquid, standardised larger bar may attract a stronger institutional or dealer market than a small or less common product.
However, size alone does not determine the spread.
Brand, refinery, purity, product type, market demand, availability and current inventory can all influence the price.
Coins can behave differently from bars
A bullion coin can also carry a different premium from a cast or minted bar containing the same amount of precious metal.
A coin may involve additional manufacturing, design, packaging and distribution costs.
Popular sovereign bullion coins can also have strong secondary-market demand, which can support their premiums.
This creates an important distinction:
The value of the metal and the value of the physical product are related, but they are not always identical.
A one-ounce gold coin and a one-ounce gold bar may contain almost exactly the same quantity of gold, but they can trade at different prices.
What happens when physical demand increases?
This is where the physical bullion market becomes particularly interesting.
When demand is normal and dealers have plenty of stock, competition between suppliers can help keep physical premiums and spreads relatively contained.
But when demand suddenly increases, the situation can change.
Imagine a market where dealers normally have plenty of one-ounce gold bars available.
Then demand accelerates.
Customers begin buying more bullion than refiners and wholesalers can immediately replace.
Inventories fall.
The dealer now has two choices:
Pay more to acquire replacement stock, or allow the product to sell out.
If the dealer wants to continue supplying customers, the price of available physical bullion may rise relative to the spot price.
This is how a physical premium can expand.
Physical scarcity can create a second market price
This distinction is important.
The international spot market may continue functioning normally while the physical market becomes increasingly tight.
The spot price might say one thing.
The price required to obtain an immediately available physical bar can say something else.
The World Gold Council notes that gold has a huge above-ground stock, but only a portion is readily available as investment bullion. Its 2026 market primer estimates around 220,000 tonnes of gold above ground, while investable physical gold represents a much smaller segment of the overall market.
This is why investors should not assume that a shortage of a particular physical product necessarily means that the entire global gold market has run out of gold.
The issue can be availability of the right product, in the right location, at the right time.
Demand can change the spread
The physical bullion spread is not necessarily fixed.
It can change with market conditions.
When physical demand is weak:
Buy premiums may narrow
Dealer inventories may increase
Competition between suppliers may increase
Buy-back spreads may remain relatively stable or become more competitive
When physical demand becomes exceptionally strong:
Available inventory can fall
Replacement costs can rise
Retail premiums can increase
Delivery times can lengthen
Certain products can temporarily become unavailable
The market is responding to supply and demand.
Perth Mint, for example, reported an unprecedented surge in retail activity during the 2025 gold price rally, with customer numbers increasing sharply and people queuing before opening. The Mint expanded its bullion service area and added temporary counters to handle the increase in demand.
That is a useful real-world example of what happens when physical demand suddenly accelerates.
The spread can move in both directions
One of the most interesting aspects of a tightening physical market is that the buying spread and selling spread do not necessarily move together.
Suppose a dealer is struggling to source physical bullion.
The price to a customer wanting to buy a scarce bar may increase substantially because the dealer has to pay more to replace its inventory.
At the same time, if the dealer desperately wants to acquire more physical metal from existing holders, it may become more aggressive on its buy-back price.
In simple terms:
The price to buy physical bullion can move higher relative to spot.
The price to sell physical bullion can move closer to spot — or, in an exceptionally tight market, become much stronger.
This can cause the traditional retail spread to compress.
An example
Imagine, purely as an illustration, that spot gold is:
$6,000 per ounce
A physical one-ounce bar might normally sell for:
$6,100
And a dealer might normally buy it back for:
$5,950
The difference between the two physical prices is:
$150
Now imagine a major surge in physical demand.
New bars become difficult to source.
The dealer may need to pay more to acquire replacement stock, and the retail price could rise to:
$6,250
At the same time, the dealer may increase its buy-back price to:
$6,050
The spread has now fallen from $150 to:
$200
In this particular example the spread actually widens because the retail premium rose faster than the buy-back price.
But consider a more extreme shortage.
The retail price could rise to:
$6,300
while the dealer, desperate to acquire physical stock, offers:
$6,200
The spread would then be only:
$100
The important point is that the two sides of the market can react differently.
There is no permanent mathematical relationship between spot, retail physical premiums and buy-back prices.
What happens if physical bullion becomes genuinely difficult to obtain?
This is where the future could become particularly interesting.
If global investment demand for physical gold and silver continues to increase while readily available finished bullion remains constrained, the premium for immediate physical delivery could rise substantially.
The World Gold Council’s 2026 outlook expects bar and coin accumulation to remain an important part of gold investment demand, supported by geopolitical uncertainty, inflation concerns and a lack of attractive alternatives in some markets.
If demand grows faster than the supply of immediately available bars and coins, the physical market can become increasingly competitive.
A dealer who has stock today may be in a very different position from a dealer who has to order new stock tomorrow.
And this is where inventory has value.
Physical bullion sitting securely in a vault is immediately available.
A product that has to be refined, manufactured, transported and delivered is not.
The paradox of a physical shortage
A particularly interesting scenario could therefore develop in a future period of extreme physical demand.
The spot market might show a certain gold price.
But the price to acquire an immediately deliverable physical bar could carry a substantial premium.
At the same time, dealers could become increasingly willing to pay higher prices to acquire bullion from existing holders because replacing that inventory has become difficult.
In such an environment:
The buy price for new physical bullion could rise significantly above spot.
The dealer’s sell-back price could move closer to the physical replacement price.
The spread between buying and selling physical bullion could potentially narrow.
This is not a prediction that this will necessarily happen. It is a logical consequence of a market where physical supply becomes constrained relative to demand.
Why larger bars can become particularly interesting
Large standardised bars can have an important role in wholesale markets.
They generally have lower fabrication costs per ounce than smaller products and can be attractive to professional investors and institutions.
However, larger bars are not automatically better for every investor.
A 1kg gold bar represents a substantial investment and is less divisible than ten 100g bars or many smaller units.
This creates a trade-off between:
Lower premium per ounce
and
Greater flexibility when selling.
A smaller bar may carry a higher premium but can be easier to sell in smaller portions.
A larger bar may offer greater efficiency but concentrates more capital into one piece of bullion.
The right choice depends on the investor’s objectives.
The same principle applies to silver, but often more dramatically
Silver can exhibit even more pronounced differences between spot and physical prices.
Silver bullion products can involve significant manufacturing, refining, minting and distribution costs relative to the underlying metal value.
When demand suddenly increases, premiums on popular silver products can move substantially.
This is why an investor can see a particular silver spot price on a financial screen while the price of an immediately available physical silver coin or bar is considerably higher.
The World Gold Council’s data also tracks local gold price premiums and discounts, demonstrating that the price paid by consumers in different physical markets can diverge from international benchmark prices.
Don’t judge a bullion investment by the spot price alone
One of the biggest mistakes a new bullion investor can make is to compare the price they paid for a physical bar directly with today’s spot price and assume the difference represents a loss.
It may not.
The correct comparison is:
What did I pay for this particular physical product?
versus
What is the current buy-back price for this particular physical product?
The Perth Mint itself publishes separate prices for selling bullion to customers and buying bullion from customers, illustrating the distinction between the two sides of the physical market. Its published prices also vary by product size and type.
This is the real-world physical bullion market.
FirstGold: Why understanding the spread matters
At FirstGold, we believe investors should understand what they are buying, what they are paying for it and what determines its eventual value when they sell.
Physical bullion is different from buying a financial instrument that simply tracks the spot price.
With physical bullion, investors are acquiring an actual asset that has to be refined, manufactured, secured, stored and ultimately delivered or transferred.
That physical nature creates a market for premiums and spreads.
Those spreads can change.
They can become wider or narrower depending on supply, demand, inventory, product size, product type and market conditions.
And in a future environment where physical bullion becomes increasingly difficult to source, the relationship between spot price and physical price could become even more important.
The FirstGold takeaway
The spot price tells you the value of the underlying metal in the international market.
The physical price tells you what it costs to acquire an actual bar or coin.
The buy-back price tells you what the market is prepared to pay for that physical bullion at that moment.
Three prices. Three different functions.
And when physical demand rises sharply, those prices can move relative to one another.
For the long-term bullion investor, understanding this distinction is just as important as watching the gold or silver price itself.
Physical bullion is not simply a number on a screen. It is a finite, deliverable asset, and when demand for that asset rises faster than available supply, the physical premium can become a market of its own.
Disclaimer: The information provided in this article is for general information and educational purposes only and should not be considered financial, investment, legal or tax advice. Precious metals prices, premiums, buy-back prices and physical bullion spreads can change at any time and may vary according to market conditions, supply and demand, product type, bar or coin size, refinery, availability, transaction costs and other factors.
