The term refers to a specific gold alloy and its corresponding purity measurement. It indicates gold that is 58.5% pure, with the remaining percentage comprised of other metals added to enhance durability or alter color. For example, jewelry stamped with “585” signifies this particular level of gold content.
Understanding this standard is crucial in the jewelry and precious metals industries. It allows for accurate valuation and ensures consumers know the precise gold content of their purchases. Historically, alloyed gold has been preferred for its increased strength compared to pure gold, which is too soft for many practical applications.