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Patek Philippe

Rhodium plated

 

Although white, yellow, rose 18k gold have same gold content, and the different metals used to create the alloy tend to be cheaper, (copper, zinc, palladium etc), white gold had to be Rhodium plated to maintain the whiteness. For yellow or rose gold, Rhodium plating is optional. Rhodium is expensive, but still the difference in price between the colours is nominal and cannot be a reason for the significant difference in prices of watches considering we are talking about watches utilizing less than 100grams of gold. I assume most watch manufactures including PP do not smelt their own alloys, so the difference in price should purely be a factor of production quantities and subsequent demand.

Dean

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