Thursday, October 30, 2014

What's the Percentage of Gold in 14k? 10k? 18k?

Gold purity is defined either in Karats or fineness.  One Karat is equal to 1/24th part of fine gold, so 24k Gold is pure gold.  So to find the percentage of gold in 10k gold, you would divide 10 by 24 (10/24) and multiply by 100 to get the percentage:

  • 10k = 10/24 or 10 ÷ 24 = .416 or 41.6% gold
  • 12k = 12/24 or 12 ÷ 24 = .500 or 50% gold
  • 14k = 14/24 or 14 ÷ 24 = .583 or 58.3% gold
  • 18k = 18/24 or 18 ÷ 24 = .750 or 75% gold  
  • 24k = 24/24 or 24 ÷ 24 = 1.00 or 100% gold

Most alloys mixed with gold are different percentages of copper and silver mixed with pure gold.  When more copper is used, the result is "rose gold" or "pink gold".  When less copper and more silver is used, the result is a very pale "green" gold or pale yellow gold.  When no copper is used with the silver and gold, the result is a brighter "green gold".   White gold today uses the alloy Palladium (rather than nickel) plus silver and copper with gold, which results in an allergy-free white gold.
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