While both metals have a similar white, silvery finish, the difference between white gold and platinum is that each metal is made of a completely different mineral and alloy. White gold is created out of a composition of 75% pure gold, and 25% palladium. Platinum jewellery is made from 95% platinum and 5% cobalt. White gold has a slightly warmer hue, and then is usually plated in rhodium to give it a silver finish. Platinum has a naturally-occurring silver grey hue when shined and polished.