Choosing Bullion: What’s the Best Size to Buy for Premiums, Resale & Investing?
When buying physical gold or silver bullion, choosing what metal to buy is only part of the decision.
The size of the bar or coin can have a major impact on the premium you pay, how easily you can resell it, how flexible your investment is and how much value you receive for your money.
Should you buy ten 1 oz silver coins or one 10 oz bar? Is a 1 kg silver bar better value? Should a gold investor buy a 1 oz bar or several smaller fractional pieces?
There isn't one perfect bullion size for everyone.
This guide from Spencer Bullion Exchange explains the advantages and disadvantages of the most common bullion sizes and what investors should consider before buying.
What Is a Bullion Premium?
The spot price is the underlying market price of a precious metal such as gold or silver.
Physical bullion generally sells above spot price. The difference between the metal value and the retail price is commonly referred to as the premium.
Premiums help account for costs including refining, minting, fabrication, transport, insurance, distribution and dealer margins.
As a general principle:
Smaller bullion products usually carry higher percentage premiums.
Producing ten 1 gram gold bars generally costs more than producing a single 10 gram bar containing the same total amount of gold.
This is why larger bullion bars will often provide more precious metal for each dollar invested.
Gold Bullion – Which Size Is Best?
Gold is extremely valuable relative to its physical size, meaning even relatively small bars can represent significant amounts of money.
Common investment sizes include:
1 gram • 5 gram • 10 gram • 20 gram • 1/2 oz • 1 oz • 50 gram • 100 gram • 10 oz • 1 kg
Each has advantages.
1g–5g Gold Bars
Small gold bars provide one of the most affordable ways to begin owning physical gold.
Advantages
Lower purchase price
Easy to gradually accumulate
Easy to sell individually
Useful for investors wanting maximum divisibility
Can make attractive gifts
Disadvantages
The biggest drawback is generally the higher premium as a percentage of the gold value.
If your primary objective is obtaining the maximum amount of gold for your money, very small bars may not provide the best value.
Best suited to:
First-time buyers, gifts and investors who prioritise divisibility over the lowest possible premium.
10g–20g Gold Bars
This range can provide a useful middle ground.
Premiums will generally be lower proportionally than very small bars while the individual pieces remain relatively affordable and easy to sell.
For investors gradually building a physical gold position, these sizes can provide a good combination of:
Affordability + divisibility + resale flexibility.
1 oz Gold – The All-Round Investment Size
For many physical gold investors, 1 troy ounce is one of the most practical sizes available.
A 1 oz gold bar contains approximately 31.1035 grams of pure gold.
One-ounce bullion is recognised internationally and is produced by many major refiners and government mints.
Why investors like 1 oz gold
Premiums are generally competitive.
It is widely recognised.
There is usually strong secondary-market demand.
It is easy for bullion dealers to test and value.
You can sell part of a larger holding without liquidating everything.
For these reasons, 1 oz gold bars and coins offer a particularly useful balance between premium efficiency and resale flexibility.
50g–100g Gold Bars
As the bar size increases, premiums will often become more efficient.
A 100g gold bar, for example, may have a lower percentage premium than purchasing the equivalent gold weight through multiple smaller bars.
However, there is a trade-off.
If you own one 100g bar and need to raise a relatively small amount of cash, you cannot sell only part of it.
You must sell the entire bar.
This is why investors shouldn't consider premium alone.
Divisibility has value too.
10 oz and 1 kg Gold Bars
Large gold bars can provide excellent premium efficiency, but the individual dollar value becomes substantial.
They can make sense for larger portfolios where the investor already owns smaller denominations.
However, for many private investors, holding everything in very large bars reduces flexibility.
For example, an investor holding ten 1 oz bars can sell:
1 oz
2 oz
5 oz
or all 10 oz.
Someone holding one 10 oz bar has only one choice:
sell the entire bar.
For larger holdings, using several different sizes can therefore make sense.
Gold Bars vs Gold Coins
Another decision is whether to purchase bars or bullion coins.
Recognised bullion coins such as Australian Kangaroos are popular because they combine precious-metal content with government-mint recognition.
Bars can sometimes provide lower premiums, particularly in larger sizes.
Neither is automatically better.
Investors should compare:
Purchase premium
Dealer buyback price
Brand/refiner recognition
Condition requirements
Security packaging
Liquidity
The difference between the price you buy at and the price you can realistically sell at is particularly important.
Silver Bullion – Which Size Is Best?
Silver presents a slightly different equation because its price per ounce is much lower than gold.
Common silver investment sizes include:
1 oz • 5 oz • 10 oz • 20 oz • 500g • 1 kg • 100 oz
1 oz Silver Coins & Rounds
One-ounce silver products are extremely popular.
Advantages
Highly divisible
Easy to accumulate gradually
Widely recognised
Easy to sell in smaller quantities
Large range of designs available
Disadvantages
Premiums per ounce can be significantly higher than larger silver bars.
If you're purchasing substantial amounts of silver purely for metal exposure, buying everything as individual 1 oz pieces may increase your overall acquisition cost.
10 oz Silver Bars – A Useful Middle Ground
Ten-ounce silver bars provide a compromise between smaller pieces and larger investment bars.
They are still manageable and relatively easy to trade while generally providing better premium efficiency than buying the equivalent weight through individual 1 oz products.
For investors who want both divisibility and reasonable premiums, 10 oz silver can be worth considering.
1 kg Silver Bars – Popular for Larger Silver Holdings
The 1 kilogram silver bar is one of the most common formats for Australian physical silver investors.
One kilogram equals approximately 32.15 troy ounces.
The major advantage is premium efficiency.
Manufacturing one kilogram bar is generally more efficient than producing approximately 32 individual one-ounce pieces.
That can translate into a lower premium per ounce.
At the same time, a 1 kg silver bar remains small enough to store relatively easily and is a familiar format in the Australian bullion market.
For investors primarily seeking physical exposure to silver rather than collectability, 1 kg bars can offer a strong combination of premium efficiency and practical resale.
100 oz Silver Bars
For larger silver investors, 100 oz bars can provide even greater efficiency.
However, they introduce several disadvantages.
They are heavier.
They represent considerably more money per individual piece.
They can be less convenient to transport.
And you lose some resale flexibility.
An investor with ten 10 oz bars can sell their silver gradually.
An investor with one 100 oz bar cannot.
Large bars therefore tend to make more sense as part of an established bullion holding rather than automatically being the first size everyone should purchase.
The Cheapest Premium Isn't Always the Best Investment
This is one of the most important concepts for new bullion investors.
Imagine two bullion products.
Product A: very low purchase premium but relatively limited resale demand.
Product B: slightly higher premium but widely recognised and readily bought back by bullion dealers.
Product A isn't automatically the better purchase.
You need to consider the entire spread.
Ask:
What am I paying today?
and
What could I realistically receive if I sold it?
Bullion should therefore be evaluated based on both the buying premium and expected resale market, rather than purchase price alone.
Brand Recognition Matters
Recognised bullion products can generally be easier for dealers and investors to identify and authenticate.
Products from established refiners and government mints may therefore have advantages in the secondary market.
Packaging, serial numbers and assay certificates can also assist with identification, although professional bullion dealers should still have procedures for verifying precious metals.
When comparing two bars with identical precious-metal content, consider more than the logo.
Look at:
Premium • Buyback price • Recognition • Authenticity features • Condition • Liquidity
Don't Forget Storage
Silver becomes bulky surprisingly quickly.
Approximately 32.15 troy ounces of silver are required to make one kilogram.
A substantial silver investment can therefore require significantly more physical storage than an equivalent-value gold holding.
Before purchasing large amounts of physical bullion, consider:
Secure storage
Insurance
Transport
Accessibility
Privacy
These practical costs should form part of your investment decision.
A Balanced Bullion Strategy
Many investors don't need to choose only one size.
A physical bullion holding can instead contain several denominations.
For example, a gold investor might hold primarily 1 oz bars or coins, supplemented with some 10g or 20g pieces for greater divisibility.
A silver investor might use 1 kg bars as the core holding, while keeping some 1 oz or 10 oz products for smaller transactions.
This approach attempts to balance:
Low premiums + liquidity + divisibility + storage efficiency.
The appropriate mix ultimately depends on the investor's budget, objectives and intended holding period.
Buying Bullion in Australia
Before purchasing gold or silver bullion, compare more than today's spot price.
Consider the premium you're paying, the product's recognition, storage requirements and—importantly—how easily you could sell the bullion again.
At Spencer Bullion Exchange, we buy and sell physical gold and silver bullion and can explain the differences between available bar and coin sizes.
Whether you're purchasing your first ounce or building a larger precious-metals holding, understanding premiums, spreads and resale liquidity can help you make a more informed decision.
Spencer Bullion Exchange
180 Bourbong Street, Bundaberg Central QLD 4670
Gold • Silver • Bullion • Coins • Buy • Sell • Invest
This article contains general information only and does not constitute personal financial advice. Precious-metal prices fluctuate, and investors should consider their individual circumstances before making investment decisions.