Gold purity can be measured using the gold karat system. This system has been developed to measure the percentage of pure gold to other metals or alloys in Jewellery. You can get the gold purity information with this easy 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