The purity of gold in jewelry is often measured in karats (k). A 10k gold alloy contains 10 parts gold and 14 parts other metals, representing approximately 41.7% pure gold. Conversely, a 14k gold alloy comprises 14 parts gold and 10 parts other metals, resulting in about 58.3% pure gold content. These alloys are frequently used in jewelry making, including white gold variations, to enhance durability and alter color.
The selection of a gold alloy influences several factors including cost, durability, and appearance. Lower karat gold alloys, like 10k, tend to be more resistant to scratches and wear due to the higher proportion of other metals. However, higher karat alloys, such as 14k, possess a richer gold color and may be more suitable for individuals with metal sensitivities due to their increased gold content. Throughout history, the use of varying gold purities has reflected both economic considerations and aesthetic preferences.