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kt (or Karat/Carat) is the measurement used used on gems and pearls. A carat in gems and pearls is measuring the mass of the item (a single carat is equal to 200 milligrams). A carob seed was originally used in measuring the mass of these objects hence the term carat. Please note, a kt in gold is different than a kt in diamonds. A carat in gold is referring to the purity of the item and not its mass.

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17y ago

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