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Patek Philippe

Mo's scale of hardness is interesting

 

Steel=4, White gold=4, Platinum=3.5 and yellow gold=2.5. Platinum is very hard therefore, not quite as hard as steel but much harder than yellow gold. White gold is hard because of the alloy and White gold and Platinum are often Rhodium plated... Rhodium=6 and is therefore harder than steel.

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