The size of a diamond has
the biggest impact on its price. The metric carat, which equals
0.20 gram, is the standard unit of weight for diamonds and most
other gems. If other factors are equal, the more a stone weighs,
the more valuable it will be.
Here are several ways to
express 1 carat:
4 grainer (not often used in retail environment)
It is very important not
to mistake carat weight as referring to the dimensions
of a diamond. It refers to weight only. Why the
distinction? Because weight can hide in different parts of the
stone. You can have a) well-cut, b) deep, or c) shallow Diamonds.
Some may appear larger than others due to its cut.
of diamonds are expressed in the trade as a price per carat. So
when we say that the Carat Weight has the biggest
impact on the price of the stone, we refer to the unit
price per carat, not just the overall price of the
Diamond "A" = 0.25 carats and
costs $1,000 per carat. $1,000 x 0.25 = $250/stone.
Diamond "B" = 0.50 carats and costs $1,250 per carat.
$1,250 x 0.50 = $625/stone.
It is very common for people
to disregard the other C's in favour of getting the biggest possible
stone they have budgeted for. Here at diamondgrading.com, although
SIZE DOES MATTER, we feel it is just as important
for the quality of the stone to be high.
Some people may feel it
is more impressive to wear a 2 carat diamond than a 1 carat diamond.
But that's not necessarily true. A Ferrari may not be as big a
car as an Oldsmobile, but most would consider it more impressive.
is a carat?
Many people would like
to "understand" carat sizes in real terms. Here's a
simple trick to get an idea. Simply take a ruler, and look at
the table below. These are some approximate, sample carat-weight
to diameter-widths for popular sizes.
How much does
"carat weight" affect cost?
The effect of all the different
properties of Diamond on Cost is discussed in more detail in the
Cost section. For carat weight, let's take a typical Diamond for an example, and see what happens when we take it through different
A Diamond of G color and
SI1 Clarity will be in one Category of prices when it is between
0.50 - 0.69 carats. When you take that same quality Diamond and
increase the size to the next price category, which is the 0.70
- 0.89 carat range, the price increase will be approximately $1,100
per carat. Increase to the 0.90 - 0.99 carat
range, and the price increase will be approximately another $800
per carat. Increase to 1.00 - 1.49 carat range,
and the increase will be approximately another $800 per
carat. If you increase to the 1.50 - 1.99 carat range,
the price increase will be approximately $1,200 per carat.
Carat Weight" and single-stone weight categories
Carat Weight Confusion