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Fineness of Silver

Fine Silver .999 = 100% Pure Silver
Sterling Silver .925 = 92.5% Silver / 7.5% Copper
Coin Silver .900 = 90% Silver / 10% Copper
 

Fineness of Gold

Karat is a measure of the fineness of gold. 24 karat is fine gold. One karat equals 1/24 (.0417). Thus 14 karat gold is 14/24 fine gold and the balance (10/24) is alloy. The usual alloy metals are silver, copper, and zinc. Nickel is used in white gold.

Karat Fineness
10 .41667
12 .50000
14 .58334
24 1.00000
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