The carat is a unit of measuring the weight of a gemstone. One carat equals 0.2 grams, or 0.007 ounces (avoirdupois). 5-carats makes 1 gram, 10-carats makes 2 grams and so forth, and 141.7 carats make...
Source: http://www.goarticles.com/cgi-bin/showa.cgi?C=1440430
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