Rolex exclusively uses 18 ct gold, a princely alloy composed of 750‰ (thousandths) of pure gold, plus exactly the right mixture of elements including silver, copper, platinum and palladium necessary to produce the different types of 18 ct gold: yellow, Everose and white. Rolex’s jealously-guarded formulas ensure exceptional durability, polishability – and an extraordinary sheen that lasts for generations