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Patek Philippe

Platinum has a higher tensile strength than gold..

 

...but is still soft. So gold, with it's softness and lower tensile strength will both scratch and wear easily. But platinum -- soft but with higher tensile strength -- will wear differently. When you scratch platinum, the scratch isn't normally produced by removing metal, it's generally due to the metal being pushed into the surface -- like a dent. Since it doesn't wear easily, it holds its edges much better than gold. When polishing metals, you're actually removing some of the metal. This is easy to do with gold because of the lower tensile strength. It's much harder to do with platinum because of its higher tensile strength.

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