Karats to Gold Hallmarks Conversion Online calculator converter Online calculator - converter: Karats to Gold Hallmarks Conversion

 

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Karats to Gold Hallmarks


This calculator provides conversion of karats to millesimal fineness gold hallmarks (kt to hallmark) and backwards (hallmark to kt).


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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.


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