Yellow Gold There are 6 products.

For 9ct gold the stamp will normally be either the number 375, 9ct, 9kt or 9K. 9ct gold contains 37.5% pure gold (375 parts per thousand parts). 14ct gold contains 58.5% pre gold (585 parts per thousand parts). 18ct gold contains 75% pure gold (750 parts per thousand parts). Yellow gold is made by mixing pure gold with alloy metals such as copper and zinc.