18k gold is 75% pure gold, mixed with 25% other metals for strength. The "k" stands for karat, a measure of gold purity out of 24 parts — so 24k is pure gold, 18k is 18 parts gold out of 24, and 9k is a little over a third gold. The higher the karat, the richer and warmer the colour.
If you've ever wondered why two gold rings can look completely different shades, karat is usually the answer. Here's the simple version.
How the karat system works
Karats measure gold purity in 24ths. Pure gold is soft — too soft for a ring you wear every day — so jewellers mix it with metals like silver, copper and zinc to make it stronger. The karat number tells you how much of the mix is actual gold. More gold means a deeper, warmer yellow. Less gold means a paler colour and, often, a lower price.
9k vs 14k vs 18k vs 24k: the quick comparison
| Karat | Gold content | Colour | Best for |
|---|---|---|---|
| 9k | 37.5% gold | Pale, subtle yellow | Budget pieces; colour can look flat |
| 14k | 58.3% gold | Medium warm yellow | A common middle ground |
| 18k | 75% gold | Rich, warm, glossy yellow | Everyday wear with real colour payoff |
| 24k | 99.9% gold | Deep orange-yellow | Too soft for daily jewellery |
18k is the sweet spot. It has enough pure gold to give you that rich, warm glow, but enough alloy to stand up to real life. That's why it's the standard for well-made jewellery around the world.
Why Good Goods uses 18k gold vermeil
Every Good Goods piece is 18k gold vermeil: a thick layer of 18k gold bonded over solid sterling silver. You get the rich colour of 18k gold and the weight of real materials, at a price that means you'll actually wear it — not save it for someday. Each design is handcrafted in Jaipur in a limited edition of 20, so the gold on your ring is the same warm 18k you'd find on pieces many times the price.
Vermeil is not the same as gold plating. Plating uses a whisper-thin layer of gold (often low karat) over base metal like brass. Vermeil is regulated: it must be sterling silver underneath, with a much thicker layer of gold on top. If you want the full comparison, we've written an honest guide to vermeil vs plated vs solid gold.
Does higher karat gold tarnish less?
Yes, generally. Pure gold doesn't tarnish at all, so the more gold in the mix, the more tarnish-resistant the metal. 18k gold keeps its warm colour beautifully with basic care. With vermeil, a quick wipe after wearing and keeping it dry does most of the work — our jewellery care guide covers the rest in two minutes.
FAQ
Is 18k gold real gold?
Yes. 18k gold is 75% pure gold — real gold by every standard, hallmarked and recognised worldwide.
Is 18k gold vermeil worth it?
If you want the rich colour of 18k gold with real sterling silver underneath, at a price you'll happily wear every day — yes. It's real materials, not costume jewellery.
Which is better, 14k or 18k gold?
18k has more gold, so the colour is warmer and richer. 14k is slightly harder but paler. For colour lovers, 18k wins.
Why is 24k gold not used for everyday jewellery?
Pure gold is soft enough to scratch and bend with daily wear. 18k keeps most of the colour and adds the strength.
Ready to see what rich 18k colour looks like in real life? Start with our bestsellers. Wear the joy.