The weight of Diamonds and Gemstones is measured in CARATS, often
abbreviated "ct.". One carat is 200 milligrams, 5 carats
equals 1.00 gram. One carat is divided into 100 parts, called
"points". Therefore, a 25-point Diamond weighs ¼
or 0.25 of a carat, and a 50-point Diamond weighs ½ or
0.50 ct. etc.
Diamond and Gemstone weights are usually expressed in carats and
decimals. A 1.09 ct. stone, for example, would be described as
one point o nine carats. A Diamond that weighs 0.99 ct. is said
to weigh ninety-nine points.
The price per carat of Diamonds on a World Gemmological
Laboratory , as with any Diamond, will increase with size; all
other factors being equal. Therefore, a 0.50 ct. Diamond will
cost more than twice that of an equal quality 0.25 ct.
While most people would like to own a large Diamond,
it is important to keep in mind that to determine a Diamonds value,
a variety of factors must be taken into consideration. Cut, clarity,
color and carat weight, not one of them being any more important
than the others, all have to be considered together in determining
the true value of a Diamond.