Platinum and white gold are both precious metals. Platinum is rarer and more expensive than white gold. It’s stronger too. White gold has a distinct shiny silver colour, whereas platinum looks more greyish-white. Both are mixed with other metals for strength. BAUNAT for example alloys its white gold with palladium, a rare precious metal which ensures a long lasting colour of the white gold. A ring in white gold is more traditional and more symbolic than a platinum one.