The term signifies gold that is 75% pure. This is determined by dividing the pure gold content (750 parts) by the total possible parts (1000). For instance, a piece of jewelry marked with this designation contains 75% gold and 25% other metals, often alloys like silver, copper, or zinc, added to enhance its durability and alter its color.
This level of gold purity strikes a balance between value and practicality. Pure gold, being very soft, is easily damaged. The addition of other metals increases its strength and resistance to wear, making it more suitable for everyday use in jewelry and other applications. Historically, this composition has been favored for its aesthetic appeal and its inherent monetary worth.