Carats can be one of those jewellery words that sounds simple… until you start shopping and realise it means different things depending on whether you’re talking about gold or gemstones. Let’s clear it up once and for all, shall we?
Carats in Gold ✨
When we talk about gold carats (or “karats” if you’re across the pond), we’re talking about purity.
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24ct gold is pure, soft, and rarely used in jewellery because it bends too easily.
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18ct gold is 75% pure, a beautiful balance of richness and strength — a Polka favourite. (750 hallmark)
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9ct gold is 37.5% pure, making it more affordable and hard-wearing, though paler in colour. (375 hallmark)
So when you pick up a ring and see '750' stamped inside, it’s telling you the blend of gold to other metals.
Carats in Gemstones 💎
With gemstones, it’s a different story: here carats measure weight, not size.
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One carat = 0.2 grams (about the weight of a paperclip).
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But size varies depending on the type of gem — a one-carat diamond will look different to a one-carat sapphire because of density.
That’s why you’ll sometimes see a dainty stone with a surprisingly big carat number (or vice versa).
Why It Matters
Understanding carats helps you make sense of jewellery pricing, and value. Higher carat gold is richer but softer, while lower carat is more durable and wallet-friendly. With gemstones, it’s about appreciating weight alongside cut, colour, and clarity (all of which affect the sparkle factor).
Polka Picks Right Now
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Rose Cut Diamond Oak Earrings – proving that smaller carats can have serious charm.
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Green Sapphire & Diamond Stacking Rings – lovely in lower carat gold, designed for everyday wear.
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Trio Nugget Pendant – a playful piece that shows gold’s character, whatever the carat.
Final Thought
Carats aren’t about “bigger is better” — they’re about balance: strength, beauty, and what feels right for you. At Polka, we love helping you find that sweet spot.
So next time you spot “ct” in our cabinet, you’ll know exactly what it’s whispering.