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The weight of a diamond is expressed in carats. The word carat originated from
the carob tree or Ceratonia siliqua. The tiny seeds of this tree are well known
for their uniformity and consistent weight. Traditionally diamonds and
gemstones were weighed against these seeds until the system was standardized,
and one carat was fixed at 0.2 grams.
One carat is divided into 100 points. A diamond weighing one quarter of a carat
can also be described as weighing 25 points or 0.25 carats. Points are
generally not used to describe weights over one carat.
It is very important not to mistake carat weight as referring to the dimensions
of a diamond. It refers to weight only.
Prices of diamonds are expressed as price per carat. So when we say that carat
weight has the biggest impact on the price of the stone, it refers to the unit
price per carat, and not just the whole price of the stone.
Diamond "A" = 0.25 carats and costs $1,000 per carat. $1,000 x 0.25 =
Size of a diamond Vs Rarity:
rarity of a diamond is greatly affected by its
size. The rarity of a 1.00 carat diamond is much
greater than twice that of a .50 carat. Although
it only weighs twice as much, the 1.00 carat is
statistically much more difficult (rare) to mine
than the .50