Gold purity can be measured using the gold karat system, developed to measure the percentage of pure gold to other metals or alloys in jewlery. You can assess gold purity with this simple chart.
| Number of Karats | Parts of Gold | % of Gold Purity | Millesimal Fineness |
| 9K | 9/24 | 37.5 | 375 |
| 10K | 10/24 | 41.7 | 416/417 |
| 12K | 12/24 | 50.0 | 500 |
| 14K | 14/24 | 58.3 | 583/585 |
| 18K | 18/24 | 75.0 | 750 |
| 22K | 22/24 | 91.7 | 916/917 |
| 24K | 24/24 | 99.9 | 999 |
Gold Purity Conversion Chart
Source: OwlCation
Gold Purity Infographic Chart
check infographic here