14k vs 18k Gold

Karat measures gold purity out of 24. 18k is 18 parts gold and 6 parts alloy, or 75 per cent pure gold. 14k is 14 parts gold and 10 parts alloy, or 58.3 per cent pure gold. The alloy is what adds strength to an otherwise soft metal.

More gold means richer colour and a softer ring. More alloy means a paler colour and a harder ring. The right choice depends on whether you want colour and prestige, or hardness and value.

Pure gold is 24 karat. It is too soft for jewellery on its own, so other metals are alloyed in. The number before the "k" is how many parts of every 24 are pure gold. 14k gold is 58.3 per cent gold, stamped 14k or 585. 18k gold is 75 per cent gold, stamped 18k or 750. 22k is 91.6 per cent gold, used in cultural jewellery but too soft for engagement rings.

The alloy also affects colour. Yellow gold is alloyed with silver and copper. White gold uses palladium and silver, then gets plated with rhodium. Rose gold uses copper, which gives the pink tone and adds hardness on top.

In yellow gold, 18k reads richer and deeper than 14k, which is slightly paler and less saturated. Side by side the difference is clear; on its own each looks like itself.

In rose gold, the karats flip. 14k rose gold actually reads pinker than 18k because more of the alloy is copper. 18k rose gold is a softer, more elegant pink. In white gold, both look identical when freshly plated with rhodium. As the plating wears, 14k shows a slightly more yellow underlying alloy.

14k gold is harder than 18k because more of the metal is alloy. That means it resists scratches and dents better and holds stones in their prongs more securely over decades. For a ring worn every day on a busy hand, 14k is the more practical choice.

18k is still durable enough for everyday wear, but it scratches more easily and benefits from a slightly more careful wearer. Both polish back to a bright finish.

Solid 14k gold does not tarnish, rust or fade. The same is true of 18k gold. Gold itself is chemically stable, and the alloy in solid gold is not enough to cause tarnishing in normal wear.

What can dull the finish is a build-up of skin oils, lotions, soap residue or sunscreen. A wash in warm soapy water brings the shine back. Note that gold filled and gold plated jewellery is a different story; both can tarnish as the base metal underneath reacts. The advice on this page is for solid 14k and 18k gold.

More pure gold means less alloy in contact with the skin, so 18k is generally gentler for people with metal sensitivities. The most common trigger is nickel, which is used in some older or lower-grade white gold alloys. Modern palladium-based white gold avoids it. Yellow and rose gold rarely cause reactions at either karat.

18k contains roughly 30 per cent more pure gold than 14k, so a piece in 18k typically costs 20 to 30 per cent more than the same piece in 14k. As the AUD gold price moves, the gap widens or narrows.

Resale value follows the same pattern. 18k holds more recoverable gold by weight, though resale of finished jewellery is rarely close to the new price for either karat.

Choose 14k for an engagement ring worn every day, especially if you are active with your hands or want more of the budget going into the centre stone. Choose 18k if you want a richer yellow or a softer rose, prefer more pure gold against the skin, and are willing to be a little gentler with the ring.

For white gold, the karat decision matters less because the rhodium plating sets the colour either way. For yellow and rose gold, the karat is one of the most important visual choices you make.