Blue Nile Glossary
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  Karat:  
  Measurement of the purity of gold. Pure gold is too soft to withstand the stresses of every-day wear, so it is alloyed with a mixture of metals like silver, copper, nickel, and zinc to give it strength and durability. Products made from gold are marked to show how much actual gold is contained in the product:
  • 24 karat = 100% gold
  • 22 karat = 91.7% gold
  • 18 karat = 75.0% gold
  • 14 karat = 58.3% gold
  • 10 karat = 41.7% gold

See also: Carat, Gold Education.

 

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