What is JAU on jewelry?

JAU in jewelry typically refers to the measurement of gold purity, specifically indicating the proportion of gold in a piece. The term stands for "Jewelry Alloy Unit," where a higher JAU signifies a greater gold content in the alloy. For example, a jewelry piece with a JAU of 750 contains 75% gold, making it 18-karat gold. This measurement helps consumers assess the quality and value of gold jewelry items.