Platinum vs White Gold for Engagement Rings: The Honest Comparison

The single most expensive piece of jewellery many people will buy is an engagement ring. The metal choice typically platinum or white gold gets glossed over with a 30-second sales pitch. It deserves more attention.

The metals themselves

Platinum in jewellery is typically 950 fineness (95% pure platinum, alloyed with iridium, ruthenium, or cobalt). It is denser than gold, hypoallergenic, and naturally white. White gold is 18K or 14K gold alloyed with white metals (palladium, nickel, silver) and almost always rhodium-plated to achieve a brilliant white finish.

• Platinum density: 21.45 g/cc (40% denser than 18K white gold)
• 18K white gold density: ~15.5 g/cc
• Platinum spot price (typical, 2024-25): $900-1,000/oz
• Gold spot price (typical, 2024-25): $2,400-2,800/oz
• Rhodium replating: required every 2-5 years for white gold

How they age differently

Platinum develops a soft surface patina rather than wearing away. The metal is displaced rather than removed when scratched, so the ring's mass is preserved over decades. White gold, in contrast, slowly wears thin, and crucially the rhodium plating wears off, exposing the slightly yellow underlying alloy. Replating is a recurring cost most buyers do not anticipate.

"A platinum ring you can pass to your grandchild. A white gold ring you can pass to your grandchild after three replatings and a tightening." veteran bench jeweller, Hatton Garden

Cost trade-off

Platinum's per-ounce price is currently lower than gold's but its higher density means a finished ring uses more grams of metal. Net retail price difference is typically 30-60% in platinum's favour upward. Over a 30-year holding period, however, white gold's replating costs can close some of that gap.

Allergy and security

Nickel-alloyed white gold causes contact dermatitis in roughly 10-15% of wearers. Palladium-alloyed white gold avoids this but costs more. Platinum's prongs hold stones more securely than gold's because the metal is tougher under stress.

Takeaway: if budget allows, platinum is the longer-term value. If not, palladium-alloyed 18K white gold is the next best choice. Avoid nickel-heavy white gold if you wear the ring daily.