You can't. Gold jewelry refers to jewelry made of gold as the main raw material. You can't write the classification of handicrafts. You can only write the classification of gold and silver jewelry when invoicing. Gold ornaments can be divided into pure gold and k gold according to their gold content. Usually, some other metal elements are added to pure gold to increase the hardness of jewelry gold, change its color tone and lower its melting point, resulting in gold alloy jewelry with different colors and obviously different gold content.