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Carat or Karat ????

 Measure of Purity (Karat) :

One Karat = 24 * (Mass of gold in the material / Total Mass of the material)

The carat system is increasingly being complemented or superseded by the millesimal fineness system in which the purity of precious metals is denoted by parts per thousand of pure metal in the alloy. For example, an alloy containing 75% pure gold is denoted as "750".

% Pure Gold In
millesimal fineness
24 Karat 99.9 999
22 Karat 91.6 916
20 Karat 83.3 833
18 Karat 75 750
15 Karat 62.5 625
12 Karat 50 500
10 Karat 41.7 417
8 Karat 33.3 333

Unit of Mass (Carat) :

The carat is a unit of mass used for measuring gems and pearls. Currently a carat is defined as exactly 200 mg . The carat is divisible into one hundred points of two milligrams each.


Source: www.wikipedia.org