Purity, colour and durability are related, but they are not the same decision. The right gold depends on the jewel and the life it will lead.

What the karat number means

Twenty-four karat gold is close to pure gold. Eighteen karat contains 75 percent gold, while fourteen karat contains 58.5 percent. The remaining alloy changes strength, colour and working behaviour.

Higher purity produces a richer natural yellow, but a lower-purity alloy can offer useful resilience for delicate mechanisms or jewellery worn every day.

Match purity to construction

A broad ceremonial necklace and a fine pavé ring face very different stresses. Hinges, prongs and clasps may benefit from an alloy selected for strength, while a hand-worked heritage form may depend on the softness of higher-karat gold.

A responsible recommendation considers the entire object rather than treating one karat as universally superior.

Colour comes from the alloy

Rose gold gains warmth from copper. White gold uses pale alloying metals and is often rhodium finished. Even two yellow-gold alloys of equal purity can differ subtly in tone, so compare real samples in the light in which you will wear them.

Look beyond the surface

Ask about hallmarking, repairability and whether future resizing could affect the finish. A beautiful colour is most valuable when the underlying construction supports years of wear.