Platinum jewelry can be consider one of the toughest and most expensive metal then gold and others types jewelry. This precious metals, the platinum when design and combined with diamond as most designer prefer to use today. Platinum jewelry will turn to shineing again just a wash with water and amild soap while gold and other precious metals needs some chemicals to wash.
When colorless diamonds are set into platinum they remain colorless because there is no yellow color in the metal that might be attracted to the diamond. When diamonds are set into white gold, they most often pick up yellow color from the white gold as these alloys include zinc, palladium. This occurs because gold starts life as yellow gold.