22K – 91.7% (917) 20K – 83.3% (833) 18K – 75.0% (750) 14K – 58.3% (583) 10K – 41.7% (417) The United States typically uses the 10K-24K range of markers to indicate gold purity. In the U.K. and other countries, they use 417-999 marks for pure gold percentages. Higher ...