Basic Diamond 4 C's – Carat Weight
The weight of a diamond is measured using a unit called ‘carat’, where 1 carat is equivalent to 200 milligrams.
There are two ways in which the carat weight is generally denoted:
'ct', which is generally used to denote the weight of a single diamond.
'ct TW', which is called carat Total Weight. This abbreviation is generally used to denote the total combined carat weight of more than one diamond in any piece of diamond jewelry.
'Carat weight' is also used to measure the weight of other gemstones, but two different gemstones with the same 'carat weight' may not be of the same size. This is because some gemstones are denser than others.
When measuring the weight of really tiny diamonds, a different and smaller unit called 'point' is used, where each point equals one-hundredth of a carat or 0.01 carats.
Larger diamonds with higher carat weight are rare and therefore much more valuable and in demand. For example, a diamond solitaire ring with a single, large diamond will cost more than another diamond ring made up of several smaller diamonds, even if the total carat weight of all the diamonds is higher.
A useful tip while buying diamonds is to buy diamonds which have a carat weight that is just short of a full carat. For example, go for a diamond that has a carat weight of 0.90 carats rather than 1 carat. The price difference is generally quite significant, even though the carat weight and size difference is not much.
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