Gold alloys are mixtures of gold with other metals, which enhance the properties of gold for various applications. Common metals used in these alloys include copper, silver, and palladium. By combining gold with these metals, the resulting alloy can be stronger, more durable, and less expensive than pure gold, making it suitable for jewelry, electronics, and dental work. The purity of gold alloys is measured in karats, with 24 karats representing pure gold. For example, an 18-karat gold alloy contains 75% gold and 25% other metals. This system allows consumers to choose the right balance of quality and affordability for their needs.