2. It has a mix of platinum, which holds the color for years, hence the name Ever-rose. Rose gold is created by mixing gold with copper, which gives it its reddish hue. However, exposure to elements (such as UV rays or saltwater) causes the copper to fade eventually.
To counter this, Rolex mixes platinum into its rose gold alloy. Platinum holds the copper in, ensuring that the rose gold color stays as beautiful as when you first bought it.