How can I tell a platinum ring from a white gold ring?
Platinum is a naturally white metal that will never lose its brilliant lustre. All gold is naturally yellow. White gold is actually yellow gold that has been alloyed to make it look white (sometimes referred to as 'bleaching'). Over time, most white gold will begin to yellow and it will need to be regularly re-plated to maintain its whiteness.

As well as looking different, platinum also feels different. It's denser than gold so the same ring would be around 40% heavier in platinum compared with 18K gold. Platinum's reassuring weight cannot be matched by any other precious metal.