This metal alloy is a specific composition of gold, copper, and sometimes silver. The “18 karat” designation indicates that the material is composed of 18 parts pure gold and 6 parts other metals, by weight. For instance, in a piece weighing 24 grams, 18 grams would be pure gold. The inclusion of copper gives the alloy its distinctive reddish or pink hue.
The material’s value stems from its gold content, offering a balance between precious metal allure and enhanced durability compared to purer forms of gold. Copper’s presence not only imparts color but also strengthens the metal, making it more suitable for jewelry and other applications. Historically, variations of this alloy have been favored for their aesthetic qualities and relative affordability in comparison to higher karat golds.