What does karats mean is gold?

It is used to measure the purity of gold alloys. One karat (or carat) is equal to 1/24 purity by mass.

  • 24 carat (millesimal fineness 99.9% or higher)purity
  • 22 carat (millesimal fineness 91.6%)purity
  • 21 carat (millesimal fineness 87.5%)purity
  • 20 carat (millesimal fineness 83.3%)purity
  • 18 carat (millesimal fineness 75.0%)purity
  • 15 carat (millesimal fineness 62.5%)purity
  • 14 carat (millesimal fineness 58.5%)purity
  • 10 carat (millesimal fineness 41.7%)purity
  • 9 carat (millesimal fineness 37.5%)purity
  • 8 carat (millesimal fineness 33.3%)purity
  • 1 carat (millesimal fineness 04.2%)purity