Platinum sucks.. Try giving your wife a platinum ring.. She's rather want a diamond.. they're rarerer. It's true.. you killed those names, more people will buy diamond simply because they're betterer.
.HaVoC. is right, platinum is a metal, just like gold / silver, etc. Its the cast to a ring, with the diamond in it, and worth a LOT more than gold or silver (the 'traditional' engagement rings).
Never wanted this to be a convo about rings... I just used the above as an example.. What the hell does that have to do with the price of platinum and diamond... When I think diamond I think.. diamonds.. when I think platinum I think.. platinum (things)... I don't think.. ring, the cast, the thing that goes inside... I'm talking about worth, and simply by worth I think Diamond should eb the top