Conversion Table
| karat
to gold hallmarks Conversion Table: |
kt to hallmark
6 = 250
8 = 333
9 = 375
10 = 417
12 = 500
14 = 583
|
karat
to gold hallmarks
15 = 625
18 = 750
20 = 833
21 = 875
22 = 916
24 = 999 or higher
|
| gold hallmarks
to karats Conversion Table: |
hallmark to kt
250 = 6
333 = 8
375 = 9
417 = 10
500 = 12
583 = 14
|
gold hallmarks to karats
625 = 15
750 = 18
833 = 20
875 = 21
916 = 22
999 or higher = 24
|
The karat (kt) (outside of US and Canada spelling: carat, abbreviation: ct) is a measure of the purity of gold or platinum alloys. Carat purity is measured as 24 times the purity by mass. Carat rating = 24 * mass of pure gold in the alloy / total mass of the alloy. Therefore, 24 carat rating is a pure pure gold or platinum.
24 karat gold (kt) = 999 gold hallmark (millesimal fineness hallmark) or better, which is close to 100% pure gold. 12-carat gold = 500 millesimal gold fineness hallmark = 50% gold. |
