Carat Weight is simply
the weight of the diamond. By definition,
1 carat is exactly 200 milligrams. Since most diamonds
sold in the jewelry industry weigh less than 1 carat,
the carat is usually subdivided into "points."
There are 100 points in 1 carat, so that a diamond weighing
3/4 carat would be a "75 point diamond." In
1 carat = 200 milligrams = 100 points
Don't confuse the weight of a stone
and its size. This argument is similar to that of cereal
boxes or potato chips, where "contents are sold
by weight, not volume." Also, don't confuse the
carats of a diamond with the carats of a different stone.
Because different minerals have different densities,
a 1-carat diamond will have a different volume (i.e.
size) than, say, a 1-carat ruby.
Another common source
of confusion: The karats
used to measure the purity of gold have nothing to do
with the carats used to
measure the weight of a diamond. Notice the difference
If you're shopping for a diamond and
you're unsure of a stone's carat weight, simply
ask the jeweler to weigh the stone in your presence.
After making sure the balance reports "0"
when nothing is on it, place the unmounted stone
on the balance, record the number of milligrams reported
by the instrument, and divide by 200 to determine the carat
weight of the stone.
Don't make the mistake of shopping
"for the biggest diamond at the best possible price."
You will likely end up with a stone of such inferior
quality in clarity, color, and cut that it will simply
look "cheap" when your partner compares it
to her best friend's diamond. This would be similar
to purchasing a car solely on its size without considering
features and style. If size (carat weight) is your
most important attribute, that is perfectly acceptable
-- but do consider the other 3 Cs to make sure you understand