Gold Karat Fineness

Karat	Ratio	Millesimal Fineness
24 Karat Gold	99.9 % Gold & 0.1 % Other Metal	999 or higher
23 Karat Gold	95.8 % Gold & 4.2 % Other Metal	958 or higher
22 Karat Gold	91.6 % Gold & 8.4 % Other Metal	916 or higher
21 Karat Gold	87.5 % Gold & 12.5 % Other Metal	875 or higher
20 Karat Gold	83.3 % Gold & 16.7 % Other Metal	833 or higher
19 Karat Gold	79.2 % Gold & 20.8 % Other Metal	792 or higher
18 Karat Gold	75 % Gold & 25.0 % Other Metal	750 or higher
17 Karat Gold	70.8 % Gold & 29.2 % Other Metal	708 or higher
16 Karat Gold	66.7 % Gold & 33.3 % Other Metal	667 or higher
15 Karat Gold	62.5 % Gold & 37.5 % Other Metal	625 or higher
14 Karat Gold	58.5 % Gold & 41.5 % Other Metal	585 or higher
13 Karat Gold	54.2 % Gold & 45.8 % Other Metal	542 or higher
12 Karat Gold	50 % Gold & 50.0 % Other Metal	500 or higher
11 Karat Gold	45.8 % Gold & 54.2 % Other Metal	458 or higher
10 Karat Gold	41.7 % Gold & 58.3 % Other Metal	417 or higher
9 Karat Gold	37.5 % Gold & 62.5 % Other Metal	375 or higher
8 Karat Gold	33.3 % Gold & 66.7 % Other Metal	333 or higher
7 Karat Gold	29.2 % Gold & 70.8 % Other Metal	292 or higher
6 Karat Gold	25 % Gold & 75.0 % Other Metal	250 or higher
5 Karat Gold	20.8 % Gold & 79.2 % Other Metal	208 or higher
4 Karat Gold	16.7 % Gold & 83.3 % Other Metal	167 or higher
3 Karat Gold	12.5 % Gold & 87.5 % Other Metal	125 or higher
2 Karat Gold	8.3 % Gold & 91.7 % Other Metal	83 or higher
1 Karat Gold	4.2 % Gold & 95.8 % Other Metal	42 or higher