Gold hallmark to karats (hallmark to kt) and kt to hallmark (karats to gold hallmark) Online Conversion Calculator - Converter / Chart / Table
Convert gold hallmarks to karats
(hallmark to kt)
and karats to gold hallmarks
(kt to hallmark)
Online Conversion Calculator - Converter

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


Enter gold hallmarks or karats for conversion:
   

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Conversion Chart / Table
gold hallmark to karats Conversion Chart / Table: karats to gold hallmarks Conversion Chart / Table:
hallmark = kt

250 = 6
333 = 8
375 = 9
417 = 10
500 = 12
583 = 14
gold hallmark = karats
625 = 15
750 = 18
833 = 20
875 = 21
916  = 22
999 or higher  = 24
kt = hallmark

6 = 250
8 = 333
9 = 375
10 = 417
12 = 500
14 = 583
karats = gold hallmarks
15  = 625
18  = 750
20  = 833
21  = 875
22  = 916
24  = 999 or higher

The millesimal fineness gold hallmark system is used to denote the purity of gold, platinum or silver alloys by parts per thousand of pure metal by mass in the alloy. Therefore, an alloy containing 50% gold is denoted as "500", 75% gold = "750" etc. Many European countries use millesimal hallmark stamps rather than karat rating stamps.
999 gold hallmark (millesimal) or better, which is close to 100% pure gold = 24 karat gold (kt). 500 millesimal fineness gold hallmark = 12-karat gold = 50% gold alloy.


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Gold hallmark to karats (hallmark to kt) and kt to hallmark (karats to gold hallmark) Online Conversion Calculator - Converter / Chart / Table

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