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Carat purity | | Carat purity: Encyclopedia - Carat purity | | | Carat is a measure of the purity of gold and platinum alloys. One carat in this sense is one twenty-fourth purity by weight. Therefore 24-carat gold is pure gold, 12-carat gold is 50% purity, etc. In the United States and Canada, the spelling karat is usually used for the measure of purity, while carat refers to the measure of mass.
The carat system is increasingly being complemented or superseded by the millesimal fine ...
| | | Carat purity | | |
| | | Carat purity: Encyclopedia - Carat purity
Carat (purity)
For other meanings, see Carat.
Carat is a measure of the purity of gold and platinum alloys. One carat in this sense is one twenty-fourth purity by weight. Therefore 24-carat gold is pure gold, 12-carat gold is 50% purity, etc. In the United States and Canada, the spelling karat is usually used for the measure of purity, while carat refers to the measure of mass.
The carat system is increasingly being complemented or superseded by the millesimal fineness system in which the purity of precious metals is denoted by parts per thousand of pure metal in the alloy.
The most common carats used for gold in bullion, jewellery making and goldsmithing are:
- 24 carat (millesimal fineness 999)
- 22 carat (millesimal fineness 916)
- 20 carat (millesimal fineness 833)
- 18 carat (millesimal fineness 750)
- 16 carat (millesimal fineness 625)
- 14 carat (millesimal fineness 585)
- 10 carat (millesimal fineness 417)
- 9 carat (millesimal fineness 375)
Categories: Units of purity | Metals
Other related archivesCanada, Carat, Metals, United States, Units of purity, alloys, bullion, gold, jewellery, mass, millesimal fineness, platinum, precious metals, purity
 Adapted from the Wikipedia article "Carat purity", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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