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Carats or Karats?
Two Different Meanings
The word carat (or karat in the USA) has two distinctly different meanings, both used in the jewellery industry.
When the word “carat” is applied to gemstones, including diamonds, it means a unit of weight. A carat is equal to one fifth (0.20) of a metric gram. It is actually incorrect to refer to a “1 carat sized” diamond, it should be referred to as being a “1 carat weight” diamond.
A carat is 1/24th by weight
A carat as applied to gold alloys means a proportion by weight of one part in twenty-four, 4.166%, or 41.66 parts per 1000. The higher the carat value, the higher the proportion of gold in relation to the base metal content. Pure gold is therefore 24 carat.