Carat is the term used to express the weight of a diamond, with one carat
equaling 200 milligrams of actual weight.
The abbreviation ct is a shortened way to write carat, and refers to the weight
of a single diamond.
The abbreviation ct TW means carat total weight, and is used to express the
total weight of multiple diamonds used in a piece of jewelry.
Carat Weight vs. Size
Carat weight is used as a measure for other gemstones, but different gems of the
same weight aren't necessarily the same size, because some gemstones are more
dense than others--meaning that they pack more weight into a smaller space.
Weight of Small Diamonds
The weight of smaller diamonds is often expressed as points, not carats. There
are 100 points in a carat. Another way to look at it is to say that each point
equals 0.01, or one-hundredth, of a carat.
0.05 means five one-hundredths, so a 0.05 carat diamond equals five points.
0.25 means twenty-five one-hundredths, so a 0.25 carat diamond equals
twenty-five points--or one quarter of a carat.
How Carat Weight Affects Value
Larger diamonds are more rare and in more demand than smaller diamonds of the
same quality, so they can be sold for a higher price. A one carat diamond
solitaire ring is nearly always more expensive than a diamond ring made up of
multiple diamonds that are similar, but smaller, even though they total one
carat or more.
Diamonds that weigh just under the next full carat are typically less expensive
than diamonds passing the full-carat hurdle. JewelryByNET.com offers this
opinion about carat weight: Try to find a diamond that weighs 90-points (9/10ths
carat), rather than a full 1-carat, or 1.90 carats rather than a full 2-carats,
and so on. When set, no one can see the difference, but you'll enjoy a big
savings in cost.
Diamond comparisons are useless unless they're made among diamonds with similar
qualities and features.
Considering the price per carat is a good way to compare the costs of similar
diamonds. Divide the cost of each stone by its carat weight to calculate its
price per carat.
There is no single visual diagram that can illustrate diamonds of different
carat weights, because variations in shape and cut make stones of similar
weights look very different. A diamond weight estimator, a sheet with cutouts
for different diamond shapes and sizes, can help give you a preview of how a
diamond's size relates to its carat weight.
Carat weight is only one diamond characteristic that you should explore before
you buy a diamond. Take some time to understand more diamond basics before you
Although the standard grading system includes 4 characteristics, at Jewelry By
Net we add a fifth C. It stands for confidence. Our diamond buyers select
diamonds by using specific guidelines to offer the most popular cuts and
qualities at the best possible price. This provides you with the confidence to
know that you are receiving the best value.
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Personalized Jewelry item weights are approximate and based on an average, as weights can vary slightly depending on customers chosen characters used.
Stated item weights are approximate and based on an average, as weights can vary slightly.
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