Sovereigns vs Britannias: Which UK Gold Coin to Buy

Both are UK legal-tender CGT-exempt gold coins, both are made by the Royal Mint, and both retain bullion-floor protection. The Sovereign (7.988 g 22-carat gold, 7.32 g pure gold content) has been in continuous production since 1817 and carries 200+ years of numismatic provenance. The 1 oz gold Britannia (31.1035 g 24-carat fine gold) is purer, larger, and more bullion-focused. Choose the Sovereign if you want numismatic-premium upside on rare-date / mintmark variants and a smaller-unit gold holding. Choose the Britannia if you want pure-gold purity and easier resale via international bullion channels. Many investors hold both for diversification.

A full sovereign weighs 7.988 g and contains 7.32 g of pure gold (22-carat / .916 fineness). A 1 oz gold Britannia weighs 31.1035 g and contains 31.1 g of pure gold (.999 24-carat fineness). Per unit, the Britannia carries 4.25x the gold content. By unit price at £1,800/oz spot: sovereign £425, Britannia £1,800. The Britannia ladders upward via 1/4 oz, 1/2 oz, 1 oz, 2 oz, 5 oz and 10 oz variants; the Sovereign ladders downward via half-sovereign and quarter-sovereign.

Yes. UK Capital Gains Tax exempts any coin that is legal tender of the United Kingdom. Both the Sovereign and the gold Britannia (in all sizes) are legal tender (face values of £1 and £100 respectively) and therefore CGT-exempt indefinitely — regardless of holding period or capital gain. This is one of the major structural advantages of UK gold coins over imported gold. See our CGT-exempt coins UK guide.

Spread depends on date, condition and seller, but as a rule: 1 oz gold Britannia typically trades at 3-6% premium over spot at established UK bullion dealers (BullionByPost, Atkinsons, Chards), common-date Elizabeth II / Charles III sovereigns at 4-7%, Victorian sovereigns at 8-15%, and scarce-date sovereigns (1819, 1879 Sydney, 1908 Canada) at 20-100%+ depending on rarity. For straight bullion exposure, the Britannia is slightly cheaper to acquire; for numismatic upside potential, sovereigns are the better choice.

Yes, both. Sovereigns: half sovereign (3.994 g, 19.30 mm), quarter sovereign (1.997 g, 13.50 mm), full sovereign (7.988 g, 22.05 mm), double sovereign (15.976 g, 28.40 mm) and quintuple sovereign (39.94 g, 36.02 mm). Britannias: 1/40 oz, 1/20 oz, 1/10 oz, 1/4 oz, 1/2 oz, 1 oz, 2 oz, 5 oz, 10 oz. Fractional sizes carry higher per-gram premiums (smaller coins cost relatively more to mint per gram of gold).

Five tests. Weight: sovereigns 7.988 g ±0.020 g; Britannias to specification. Diameter: sovereign 22.05 mm; 1 oz Britannia 38.60 mm. Magnet test: 22-ct and 24-ct gold are non-magnetic; any pull means plated steel. Edge: milled (reeded), seam-free; cast counterfeits show a faint horizontal seam. Specific gravity: 22-ct gold 17.7 g/cm³, 24-ct gold 19.3 g/cm³. Tungsten counterfeits match weight but fail SG test. For coins worth £500+, professional grading at PCGS / NGC / CGS UK is the safety net — see our grading services comparison.

Yes, but they have a different tax wrinkle. UK silver Britannias (1 oz, .999 fine, £2 face value) are legal tender and therefore CGT-exempt. However, they carry 20% VAT at purchase (gold coins are VAT-free in the UK and EU), making them more expensive to acquire per ounce of metal. For pure gold investment the Britannia gold is more efficient; for a "stack" of silver, silver Britannias are still useful but understand the VAT cost.

Bullion floor for both = (gold spot price) × (pure gold content). For a sovereign at £1,800/oz spot: 7.32 g × (1,800/31.1035) = ~£425. The selling price will always be at or above this floor (no rational seller takes less) plus a small numismatic premium. Common-date sovereigns and Britannias trade close to floor; rare-date sovereigns trade well above. The floor is the stop-loss in your investment thesis.

Three tiers. Royal Mint direct (royalmint.com): newest issues, often with limited-mintage proof and BU options at slight premium. UK bullion dealers: BullionByPost, Atkinsons, Chards, Hatton Garden Metals — competitive pricing for common-date material, fast UK delivery. UK auction houses: Spink, Baldwin's, London Coins, Coin Cabinet for rare-date / mintmark material. eBay UK works for graded slabbed pieces but be cautious on raw gold for high-value (use authentication / grading first).

Bullion: struck for investment. Plain finish, modest packaging, lower premium over spot. The 1 oz gold Britannia bullion is the standard. Proof: struck for collectors. Mirror-finish fields, frosted-cameo design relief, Royal Mint clamshell case with Certificate of Authenticity, 20-50% premium over bullion. Proof variants are limited mintage and held more for numismatic appeal; bullion is held for gold exposure with minimal premium.

Gold doesn't tarnish, so storage is about preventing physical damage rather than chemical preservation. Original Royal Mint capsules are fine indefinitely; for loose coins use individual airtight capsules sized to the diameter (Lighthouse Quadrum, AirTite). For collections worth £5,000+ consider an external safe deposit box (Metropolitan Safe Deposits, Mersey Safe Deposits) or vaulted gold accounts (Royal Mint Vault, IBV International). See our coin storage UK guide.

The Sovereign has been struck continuously since 1817 (with brief gaps for major design changes and during WWII shortages); the Royal Mint has stated the Sovereign will continue indefinitely as the flagship UK gold coin. The Britannia has been struck since 1987 and was originally intended as the modern UK bullion answer to the Krugerrand. Both have ongoing programmes through Charles III's reign and beyond.