Gemstone Size and Weight
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Carat
A carat, as a unit of weight, originally comes from the Arabic qirat which
was roughly the weight of 4 grains and was traditionally used to weigh small amounts.
Dictionary Definition
A unit of weight in gemstones, 200 milligrams (about 3 grains of troy or avoirdupois weight).
Abbreviation: c., ct.
Originally, carats weights were only used to measure diamonds but carats have
now become the accepted unit of measurement for gemstones as well.
The weight of a gemstone does not necessarily correspond to its size.
The reason for this is that difference gemstones have different densities.
A one carat round cut ruby will not have exactly the same measurements as a one carat
round cut sapphire or emerald because of their different relative densities.
Carat Total Weight
Total carat weight (cttw) is the weight of all the
gemstones in an item of jewelry added together.
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