Karat (kt) gold: Pure gold is 24kt, meaning 24 out of 24 parts are gold. 24kt is too soft to be functional, so it is alloyed with other metals for durability, cost and color. 14kt is 14 parts gold out of 24, and the remaining 10 parts are other metals. Depending on the color of gold (which can be yellow, rose, green or white), the other parts may be copper, silver, nickel, zinc, tin, palladium and/or manganese. People with nickel allergies should be aware that, until recently, most white gold contained nickel. Today, palladium is used to make a white gold alloy that is less likely to react to the wearer's skin. All of the solid karat gold we carry is yellow gold.