There is a reason the great European houses have always worked in 18-carat gold. It is not sentimentality. It is not tradition for tradition's sake. It is because 18ct gold is, quite simply, the correct material for fine jewellery.

Walk into any reputable jeweller on the Rue de la Paix or Bond Street and you will find 18ct as the standard. This is not a matter of regional taste. It is a difference in philosophy. One that separates jewellery made to be worn for a lifetime from jewellery made to be sold at a price point.

At Alexandria, we work exclusively in 18ct gold. Not because we are bound by tradition, but because we are bound by purpose: to create pieces worthy of the techniques we employ, and durable enough to be worn by your grandson's grandson. Anything less would be a compromise we are unwilling to make.

What 18ct Gold Actually Means

The carat system measures gold purity in parts out of 24. Eighteen-carat gold contains 75% pure gold, with the remaining 25% composed of alloying metals such as silver, copper, or palladium. These alloys provide the working hardness that pure gold lacks while preserving the qualities that make gold precious in the first place.

In millesimal fineness, the international standard, 18ct gold is marked as 750. This number, stamped on fine jewellery throughout Europe, indicates 750 parts per thousand of pure gold. You will see this mark on pieces from Cartier, Boucheron, Bulgari, and every other house that takes its craft seriously.

By contrast, 14ct gold contains 58.3% pure gold (marked as 585), with nearly 42% consisting of other metals. The difference of 16.7% may seem modest on paper. In practice, it is the difference between gold that glows and gold that merely shines.

The European Standard

In France and Italy, 18ct gold is not merely preferred. It is the legal minimum for jewellery to be sold as gold. This is not bureaucratic overreach; it reflects a centuries-old understanding that fine jewellery demands fine materials.

The French hallmarking system uses an eagle's head to denote 18ct gold, a symbol that has guaranteed purity since the 19th century. Italian goldwork, particularly from the historic centres of Vicenza and Valenza, is almost exclusively produced in 18ct. When you purchase European fine jewellery, you are purchasing this tradition of quality by default.

Britain established 18ct as its gold standard in 1478, when the Goldsmiths' Company was made responsible for assaying and hallmarking precious metals. The leopard's head, the mark of the London Assay Office, has guaranteed the purity of British gold for over five centuries. It remains one of the oldest and most respected consumer protections in the world.

The Goldsmiths' Company Hallmark

Every piece that leaves Alexandria bears the hallmark of the Goldsmiths' Company Assay Office in London. This is not a marketing decision. Under the Hallmarking Act of 1973, it is a legal requirement for any gold jewellery sold in the United Kingdom to be independently tested and marked.

The hallmark tells you precisely what you own: the sponsor's mark identifying the maker, the fineness mark (750 for 18ct gold), the assay office mark (the leopard's head for London), and optionally a date letter indicating the year of hallmarking. It is a guarantee of composition that no amount of marketing copy can replicate.

When you purchase unhallmarked gold, you are trusting the seller's word. When you purchase hallmarked gold, you are trusting an institution that has been verifying precious metals since the reign of Edward IV. For those commissioning bespoke pieces, this guarantee extends to every custom creation.

The Colour of Gold

The most immediate difference between 18ct and lower carat golds is visible to the naked eye. Eighteen-carat gold has a depth of colour, a warmth, a saturation that announces itself without fanfare. Laboratory measurements confirm what the eye already knows: 18ct yellow gold registers approximately 19% higher chromatic intensity than 14ct.

This is not subtle. Place an 18ct men's gold ring beside a 14ct ring of identical design, and even someone with no knowledge of jewellery will instinctively reach for the 18ct piece. The colour is richer. The lustre is deeper. The gold looks, for want of a better word, more like gold.

Pure 24ct gold has an almost orange hue that most people find too intense for jewellery. The alloys in 18ct gold temper this intensity while preserving warmth. The result is the buttery yellow that has defined fine goldwork for centuries.

The Weight Question: Engineering for Comfort

There is a practical reason why some jewellers default to 14ct gold, and it deserves honest acknowledgment: weight.

Gold is denser than the alloy metals typically mixed with it. A ring made in 18ct gold will weigh more than an identical ring in 14ct. For small, delicate pieces this difference is negligible. For substantial pieces, the kind of bold, sculptural rings that Alexandria creates, the difference becomes significant.

A lesser house might solve this by simply using lower carat gold. We solve it through engineering.

Each Alexandria ring is designed from the outset with weight distribution in mind. We hollow sections where metal adds mass but not structure. We thin walls where strength permits. We balance the proportions so that a ring which looks commanding on the hand does not fatigue the finger. This requires more design work, more precise CAD modelling, and more skilled finishing. It would be simpler to use 14ct. But simplicity is not what we are here to provide.

The result is a ring that maintains the colour, the lustre, and the material integrity of 18ct gold while remaining comfortable for daily wear. It is a harder problem to solve, but solving hard problems is rather the point.

A Note on Durability

It is true that 18ct gold is softer than 14ct. On the Mohs hardness scale, 18ct measures approximately 2.5 to 3, compared to 3 to 3.5 for 14ct. This difference is real, and anyone who tells you otherwise is not being honest.

However, context matters. The softness of 18ct gold is not a flaw; it is a characteristic that skilled craftsmen have worked with for centuries. That malleability allows for sharper engravings, more secure stone settings, and finer detail work. It is why the master guillocheurs of the Georgian era worked exclusively in 18ct, and why enamellists today still prefer it.

Yes, an 18ct ring may develop a patina of fine scratches more readily than a 14ct ring. Many collectors consider this patina a virtue rather than a defect. It is evidence that a piece has been worn and loved. And unlike the alloy metals in lower carat gold, which can corrode or discolour over decades, pure gold does not degrade. An 18ct piece can always be polished back to its original glory.

For pieces intended to survive generations, the higher gold content of 18ct is an asset, not a liability.

Why Heritage Techniques Demand 18ct Gold

Certain decorative techniques do not merely prefer 18ct gold. They require it.

Grand feu enamel, the centuries-old art of firing powdered glass onto metal at temperatures exceeding 800°C, produces its finest results on high-carat gold. The alloy composition of 18ct typically contains little to no zinc, allowing the enamel to bond cleanly and the translucent colours to achieve their legendary depth. Lower carat alloys, with their higher zinc content, compromise both adhesion and brilliance. This is why Fabergé worked in 18ct and higher. It was not extravagance; it was technical necessity.

Guilloché, the engine-turned engraving that creates mesmerising wave patterns beneath translucent enamel, follows the same logic. The rose engine lathe cuts cleanly into gold of this purity, producing sharp, shadow-free grooves that catch and scatter light. The master guillocheurs who supplied Rundell, Bridge & Rundell (the royal goldsmiths) worked exclusively in 18ct. Their snuff boxes and étuis from the Georgian period, many now in museum collections, bear the 18ct London hallmark without exception.

When you choose 18ct gold, you are choosing the same material that enabled the greatest decorative arts of the past three centuries.

Compatibility with Sensitive Skin

Approximately 15% of the population has some sensitivity to nickel, an alloy metal commonly used in lower carat gold to increase hardness and reduce cost. The symptoms range from mild irritation to contact dermatitis.

Eighteen-carat gold is significantly less likely to cause such reactions. The higher proportion of pure gold means fewer potentially irritating alloy metals. Quality 18ct alloys typically use silver, copper, and palladium rather than nickel, making them suitable for even sensitive skin.

If you have ever experienced a reaction to jewellery, the first question to ask is not whether you are allergic to gold. You almost certainly are not. The question is what percentage of that jewellery was actually gold.

Long-Term Value

A five-gram ring in 18ct gold contains approximately 3.75 grams of pure gold. The same ring in 14ct contains roughly 2.9 grams. The difference in material value is not marginal.

More importantly, 18ct gold maintains its colour and integrity over time in ways that lower carat alloys cannot. The alloy metals in 14ct and 10ct gold may tarnish, discolour, or degrade over decades. The gold itself does not. A higher gold content means more of your investment is protected against the passage of time.

When we speak of heirloom jewellery, we are speaking of pieces meant to outlast their original owners. That purpose demands materials equal to the ambition. Eighteen-carat gold has proven itself over centuries. Your grandfather's signet ring, if it was made properly, was made in 18ct.

The Alexandria Position

We are sometimes asked whether we offer pieces in 14ct gold. We do not. It is not a position we take lightly, and we understand it places our work beyond some budgets. But Alexandria exists to preserve and continue heritage techniques that demand the correct materials. Guilloché enamel executed on anything less than 18ct gold would be a technical compromise. We would rather make fewer pieces than make compromised ones.

Every ring, every objet d'art, every bespoke commission that leaves our workshop is hallmarked by the Goldsmiths' Company at 750 fineness. It is a guarantee that the piece meets the same standard as the great European houses, and that it is built to be worn, used, and passed down.

The difference between 18ct and 14ct gold is the difference between a suit cut on Savile Row and one that merely fits. Both will cover you. Only one will outlast you.

Frequently Asked Questions

Is 18ct gold better than 14ct gold?

For fine jewellery intended to last generations, yes. 18ct gold contains 75% pure gold compared to 58.3% in 14ct, resulting in richer colour, better compatibility with sensitive skin, and superior performance with heritage techniques like guilloché and grand feu enamel. The higher gold content also means greater long-term value retention.

What does 750 mean on gold jewellery?

The 750 stamp indicates 18ct gold in millesimal fineness, meaning 750 parts per thousand (75%) pure gold. This is the international standard marking used throughout Europe and on all pieces hallmarked by the Goldsmiths' Company in London.

Why is 18ct gold the standard in Europe?

In France and Italy, 18ct is the legal minimum purity for gold to be sold as fine jewellery. Britain established 18ct as its gold standard in 1478. This reflects a centuries-old European tradition that fine jewellery requires fine materials, distinguishing it from the lower carat standards common elsewhere.

Is 18ct gold too soft for everyday wear?

No. While 18ct gold is softer than 14ct, it has been the material of choice for fine jewellery worn daily for centuries. It may develop a gentle patina over time, which many consider a virtue. Unlike alloy metals, pure gold does not degrade, so 18ct pieces can always be polished to restore their original finish.

Is 18ct gold hypoallergenic?

18ct gold is significantly less likely to cause allergic reactions than lower carat gold. With 75% pure gold and typically nickel-free alloys (using silver, copper, and palladium instead), 18ct is suitable for most people with sensitive skin. Approximately 15% of the population has nickel sensitivity, which is more commonly triggered by lower carat gold containing nickel alloys.