If you’re shopping for gold jewellery in the UK, you’ll almost always meet three numbers: 9ct, 14ct and 18ct (also written 9k, 14k and 18k). They all describe solid, genuine gold – the difference is how much pure gold each one contains, and that single fact shapes the colour, the durability, the price and how long a piece will stay beautiful. Here’s a plain-English guide to choosing between them.
What does “carat” actually mean?
Gold purity is measured in carats out of 24. Pure gold is 24ct, but in its pure form it’s far too soft to wear – it bends and scratches almost immediately. So gold is blended with stronger metals (like copper and silver) to create a hard-wearing alloy. The carat number tells you how much of that final metal is actually gold:
- 9ct gold – 37.5% pure gold (hallmarked 375)
- 14ct gold – 58.5% pure gold (hallmarked 585)
- 18ct gold – 75% pure gold (hallmarked 750)
Everything else – the colour, the feel, the price, the longevity – flows from those three percentages.
9ct gold: the affordable option
9ct is the most affordable solid gold and the most common in the UK high street, largely because it contains the least gold. That low gold content is a genuine trade-off.
On the plus side, all that extra alloy makes 9ct very hard. But because it’s under 40% gold and heavy on other metals (often copper), it has a paler, slightly less “golden” colour, a lower intrinsic value, and – over many years – it can be a little more prone to tarnishing and, for very sensitive skin, to reactions from the higher alloy content. It’s real gold and perfectly good, but it’s the furthest from the warm, lasting gold most people picture.
14ct gold: the everyday sweet spot
14ct is where most people land for jewellery they’ll actually wear every day, and it’s the standard for fine everyday pieces around the world. At 58.5% pure gold, it’s genuinely precious and warm in colour, yet the alloy content keeps it hard-wearing and scratch-resistant. It doesn’t tarnish, it sits happily on sensitive skin (when nickel-free), and it holds its value beautifully. We make the full case in our guide to whether 14k gold is good for everyday jewellery.
18ct gold: the richest, purest choice
18ct is the purest of the three common carats at 75% gold. It has a deeper, richer, warmer colour – the gold most people think of as “proper” gold – and the highest intrinsic value. The trade-off is that more pure gold means a slightly softer metal, so it picks up fine scratches a little more easily, and it costs more. It’s the classic choice for heirloom and occasion pieces. We compare it directly with 14ct in our 14k vs 18k gold guide.
9ct vs 14ct vs 18ct at a glance
- Gold content: 9ct 37.5% · 14ct 58.5% · 18ct 75%
- Colour: 9ct palest · 14ct warm and bright · 18ct deepest and richest
- Durability: 9ct and 14ct hardest · 18ct softer but still hard-wearing
- Value: rises with carat – 18ct holds the most gold value
- Price: 9ct cheapest · 18ct most expensive
- Everyday sweet spot: 14ct (or 18ct if you want maximum purity)
How to check what you’re buying
In the UK, solid gold is independently tested and legally hallmarked – a tiny stamp of 375, 585 or 750 tells you exactly which carat you’re holding. It’s the simplest way to be sure a piece is real solid gold and not plated. Here’s how to read UK gold hallmarks.
Why we make our jewellery in 14ct and 18ct
At Larisa Beaumont we work only in solid 14ct and 18ct gold – never 9ct, and never plated or vermeil. For jewellery designed to be worn every day and passed down, we want the richer colour, the higher gold content and the longevity those two carats give. Both are hallmarked, nickel-free and ethically sourced, so whichever you choose, you’re getting real gold made to last.
So which should you buy?
If budget is the deciding factor and you don’t mind a paler colour and lower gold content, 9ct will get you into solid gold. But if you want jewellery that looks richer, lasts longer and holds its value, 14ct is the everyday sweet spot and 18ct the luxurious step up. For pieces you’ll wear constantly, 14ct is hard to beat; for something that leans heirloom, 18ct is worth the premium. There’s no wrong answer – only the one that suits your budget, your colouring and how you’ll wear it.
Frequently asked questions
Is 9ct or 18ct gold better? Neither is “better” outright – 18ct contains far more pure gold, with a richer colour and higher value, while 9ct is more affordable and very hard. For colour, value and longevity, 18ct (or 14ct) wins; for budget, 9ct.
Does 9ct gold tarnish? Because 9ct is under 40% gold and high in alloy metals like copper, it can be slightly more prone to tarnishing over many years than 14ct or 18ct, which have more gold and resist it better.
What do 375, 585 and 750 mean? They’re UK hallmarks for gold purity: 375 = 9ct (37.5% gold), 585 = 14ct (58.5%), 750 = 18ct (75%).
Which carat of gold is best for everyday wear? 14ct is the usual everyday sweet spot – hard-wearing, genuinely precious and holds its colour. 18ct is a lovely choice too if you prefer maximum purity and richer colour.
Explore solid 14ct and 18ct gold jewellery, hallmarked and ethically made in Britain, at Larisa Beaumont.
