Fineness and Karat Weight
Fineness is the actual gold content in a coin or bar and is expressed in grams or troy ounces. Karat weight is a unit of fineness for gold equal to 1/24 part of pure gold in an alloy. For example, pure gold, which is 1000 fine, is 24 karat; a fineness of .750 is expressed as 18 karat. Below are the standard karat weight to fineness conversions.
| KARATS | FINENESS | |
| 24 karats | = | 1000 fine |
| 23 karats | = | 958.3 fine |
| 22 karats | = | 916.6 fine |
| 21 karats | = | 875.0 fine |
| 20 karats | = | 833.3 fine |
| 18 karats | = | 750.0 fine |
| 16 karats | = | 666.7 fine |
| 14 karats | = | 583.3 fine |
| 10 karats | = | 416.6 fine |
