The numerical marking “750” found on gold items signifies the purity of the metal. It indicates that the item is composed of 750 parts gold per 1000, which equates to 18 karat gold. In simpler terms, 75% of the piece is pure gold, with the remaining 25% consisting of other metals such as silver, copper, or zinc. This alloying is necessary to increase the metal’s durability and modify its color.
This hallmark provides assurance of the gold content, offering consumers and jewelers a standardized method for identifying and valuing the metal. The practice of hallmarking dates back centuries, initially intended to protect consumers from fraudulent practices and to guarantee a certain standard of quality. The presence of this stamp ensures the item’s value is accurately assessed for sale, insurance, or investment purposes. The addition of other metals enhances the hardness and resistance to wear and tear, making it suitable for jewelry and other applications where pure gold would be too soft.