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Diamonds - The Four C's
THE FOURTH C - CARAT WEIGHT
The standard unit of weight used for gemstones. One carat equals .200
grams (or 200 milligrams). Usually abbreviated ct.

Diamonds are weighed to a thousandth (0.001) of a carat and
then rounded to the nearest hundredth, or point. Over a carat, diamond
weights are usually expressed in carats and decimals. A 1.03 ct. stone,
for example, would be described as "one point oh three carats," or "one oh
three." A diamond that weighs 0.83 ct. is said to weigh "eighty-three
points," or an "eighty-three pointer."
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