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Precious Metals - Karat Unit of Fineness

Units of fineness - Karat.

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The fineness of gold in coins, bars or jewelry is commonly measured in "karat" - parts per 24 - where

24 karat = 24/24 = 1 = 100 % = 1000.00 ^o/_oo
18 karat = 18/24 = 0.75 = 75 % = 750.00 ^o/_oo
14 karat = 14/24 = 0.583 = 58.3 % = 583.33 ^o/_oo
8 karat = 8/24 = 0.333 = 33.3 % = 333.33 ^o/_oo

Pure gold is yellow in color. Gold is commonly alloyed with silver, copper, nickel and zinc. White gold is an alloy with nickel, copper and zinc. Note that

24 karat gold - 100% - very soft, not recommended for jewelry
22 karat gold - 91.7% - soft, not recommended for jewelry
18 karat gold - 75% - recommended for fine jewelry
14 karat gold - 58.3% - used in average jewelry
12 karat gold - 50% - not acceptable in jewelry
10 karat gold - 41.7% - the lowest limit for products in "real" gold

Download and print Karat vs. Pure Gold Content Chart

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Related Topics

Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.

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Solids and Metals - Specific Gravities - Specific gravity for common solids and metals like aluminum, asbestos, brass, calcium and many others.
Troy Weight - Weight unit for preciuos metals like gold and silver.
Unit Converter with commonly used Units - Common converting units for Acceleration, Area, Density, Energy, Energy per unit mass, Force, Heat flow rate, Heat flux, Heat generation per unit volume and many more.

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