Originally developed as an imitation of platinum, white gold is composed of approximately 75% pure yellow gold and 25% of a metal alloy with a silvery color such as nickel, palladium or silver. Along with yellow gold, white gold is one of the most popular precious metal choices for engagement rings. In terms of their purity, they are the same. For example, 18 karat (18k) white gold and 18k yellow gold have the same level of purity.
