Carat

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The term carat is used in two completely different meanings. Firstly, as a unit of weight of precious stones, but with the second it denominates the precious metal content (fineness) of alloys, mostly gold alloys. (Here the correct spelling is karat or kt.).

  • As a unit of weight for gemstones applies:
  • 1 carat = 0.2 g (200 mg),
  • 1 gram = 5 kt.
  • For precious metals, the number of carats (or: karats) indicates the amount of a precious metal in gold alloys with respect to 24 parts.

Example: 18-karat gold is 75% gold (and is therefore called: Gold 750).