Karat
A unit of fineness representing 1/24th of the gold in a coin. 22 karat coins correspond to the .916 fine, 24 karats describes theoretically pure gold of 1000 fine, although this is generally expressed as .9999 fine.
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Key Coin
The major or most important coin in a specific series. This is usually the most highly valued coin and/or the lowest mintage coin of that series.
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Key Date
Generally descriptive of a coin which is considered to be one of the more difficult dates to obtain, either in any grade or in a specific grade, within a given series.
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Kilogram
The major metric unit of weight representing 1,000 grams or 32.15 Troy ounces.
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Knife Edge
Another term for wire edge.
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