A 1oz gold coin may appear cheaper than another on a dealer’s website, yet the better value is not always the lower displayed price. Product weight, fine-metal content, VAT, delivery and the price a dealer may pay when you sell all affect the real cost of ownership. Knowing how to compare bullion premiums helps you make a clear decision based on the metal you are buying, not just the headline figure.
For most UK investors, the aim is straightforward: buy recognised physical bullion at a fair market-linked price, with secure delivery and a realistic route to sell when needed. Premiums are part of that calculation, but they need to be viewed in context.
What is a bullion premium?
The spot price is the live market value of unallocated precious metal. A bullion premium is the amount charged above that underlying metal value for a physical bar or coin.
That difference covers more than a dealer’s margin. It can reflect refining and minting costs, secure transport, insurance, storage, handling, demand for a particular product and the cost of keeping stock available. A sought-after coin can also command a higher premium because it is widely recognised and easier to trade.
A premium can be expressed in pounds or as a percentage. The percentage calculation is:
Premium percentage = (product price – metal value) ÷ metal value x 100
For example, if the fine gold content in a coin is worth £2,000 at the current spot price and the coin costs £2,100, its premium is £100, or 5%.
This is useful, but it is only meaningful when both figures are taken at the same time. Precious-metals prices move throughout the trading day, so comparing a product price from one moment with a spot chart from several hours earlier can produce a misleading result.
How to compare bullion premiums fairly
Begin by comparing products with the same amount of fine metal. This is especially relevant for gold coins. A full sovereign contains 7.32g of fine gold, while a 1oz Britannia contains 31.1035g. Their premiums should not be compared simply by looking at their respective purchase prices.
Check the product specification for gross weight, purity and fine-metal content. For bars, this is usually simple: a 100g 999.9 gold bar contains 100g of fine gold. For coins, the stated denomination, total weight and purity can vary by issue. A coin may weigh more than one troy ounce but contain exactly one troy ounce of gold because its alloy includes copper or silver.
It is usually best to compare the same format against the same format. Compare a 1oz Britannia with another 1oz Britannia, or a 100g gold bar with other 100g bars from recognised refiners. Once you have established the premium within a category, you can decide whether a different format offers better value for your purpose.
Use the live spot price at the same moment
A dealer’s product price may update automatically as the live gold or silver price changes. If you open two websites several minutes apart during a volatile session, the apparent difference may be caused by the market rather than the premium.
Record the live spot price and the product price at the point you are ready to buy. Then calculate the metal value using the product’s fine-metal content. This gives you a more dependable comparison than relying on an advertised “from” price or a price you saw earlier in the day.
For gold, make sure you are using the relevant currency and unit. UK bullion prices are commonly shown in pounds, while the global spot market is often quoted in US dollars per troy ounce. A troy ounce is 31.1035g, not the standard ounce used for everyday goods.
Compare the total checkout cost
The price shown on a product page is not necessarily the final cost. Before judging a premium, check whether insured delivery, payment charges or any order-related costs apply. A lower product price can lose its advantage if the overall checkout total is higher.
For UK buyers, VAT also matters. Investment gold that meets the qualifying conditions is generally exempt from VAT, which is one reason it is widely used for long-term wealth preservation. Physical silver is normally subject to VAT when bought new in the UK. When comparing silver bars or coins, use VAT-inclusive prices throughout. Comparing a VAT-exclusive trade figure with a retail price will not give a fair result.
Tax treatment can depend on the product and your personal circumstances. Where tax is a key part of your decision, obtain independent professional advice.
Premiums by bullion format
Larger bars often carry a lower premium per gram or per ounce than smaller bars and coins. The refining, fabrication and handling work involved in producing a 1g bar is not proportionately lower than it is for a 100g bar. As a result, fractional bullion is normally more expensive relative to its metal value.
That does not automatically make small bars poor value. They can suit buyers who are building a position gradually or want the flexibility to sell a smaller portion later. The right choice depends on your budget, your intended holding period and how you expect to liquidate the metal.
Recognised bullion coins can carry a higher premium than equivalent-weight bars, particularly where they have strong retail demand. Gold Britannias, sovereigns and internationally recognised 1oz coins are familiar to many buyers and dealers. Their liquidity may justify part of the extra cost, especially if easy resale is more valuable to you than achieving the lowest possible entry premium.
Silver follows the same broad pattern, although VAT has a much larger effect on the upfront cost for UK retail purchasers. A kilo silver bar may offer a lower premium per ounce than several 1oz coins, while individual coins can be easier to sell in smaller amounts. There is no universal winner – the useful question is whether the format matches your reason for buying.
Look at the sell-back price, not only the purchase price
The purchase premium is only one side of the transaction. The other is the dealer’s buying price when you choose to sell. The gap between the price you pay and the price available on resale is often called the spread.
Consider two hypothetical 1oz gold products when the underlying gold value is £2,000. Product A costs £2,100 and has an indicated sell-back value of £1,980. Product B costs £2,070 but has an indicated sell-back value of £1,920. Product B has the lower purchase premium, but Product A has the narrower £120 buy-to-sell gap compared with £150 for Product B.
This does not mean the higher-priced product is always preferable. Sell-back prices can change with market conditions, stock demand, product condition and the dealer’s current buying requirements. It does show why a low purchase price alone is not enough.
Ask whether the dealer buys back the exact products it sells, how its buy prices are linked to the live market and whether there are practical conditions around packaging, proof of identity or product condition. Standard investment bullion from established mints and refiners is generally easier to assess and trade than obscure, damaged or heavily altered items.
Do not confuse collectible value with investment value
Some coins command premiums because of year, mintage, condition or collector appeal. These can be legitimate reasons to pay more, but they are different from buying bullion chiefly for metal exposure.
If your priority is wealth preservation through physical gold or silver, concentrate on fine-metal content, recognisability, purchase premium and likely liquidity. A rare-date coin may perform differently from the underlying gold price, for better or worse, and can require specialist knowledge to value correctly.
Likewise, be cautious when comparing newly minted coins with pre-owned bullion. Pre-owned bars and coins can offer excellent value where authenticity and condition have been properly checked, but packaging, presentation and resale demand may differ. The comparison should reflect the actual product, not just the headline weight.
A practical way to compare offers
Create a simple note for each product you are considering. Record the fine-metal weight, live metal value, product price, VAT treatment, delivery cost and available sell-back indication. Then calculate both the purchase premium and the buy-to-sell spread.
| Check | Why it matters | | — | — | | Fine-metal content | Ensures you are comparing equal amounts of gold or silver | | Premium percentage | Shows the cost above the live metal value | | Total paid | Includes VAT, delivery and any applicable charges | | Sell-back indication | Helps assess the potential spread and liquidity | | Product recognition | Supports straightforward resale and buyer confidence |
A small difference in premium may be less important than dealing with a business that provides clear product specifications, transparent market-led pricing, insured delivery and reliable customer support. Physical bullion is a tangible asset, so confidence in authenticity, fulfilment and resale arrangements has real value.
RPS Bullion focuses on recognised investment-grade bars and coins because clarity matters at both ends of ownership: when you buy and when you eventually decide to sell.
The most useful comparison is the one that reflects your own objective. If you want the lowest possible cost per gram, larger bars may be appropriate. If you value flexibility and broad recognition, established bullion coins or smaller denominations may be worth the additional premium. Buy the format you understand, check the figures at the same market moment, and keep your decision anchored to the amount of physical metal you will own.