A carat is the unit of weight by which a diamond is measured. One carat is equal to one fifth of a gram. The measurement of one carat is also divided up into 100 points so that a diamond weighing 0.50 carat weight is 50 points.

Size is the most obvious factor in determining the value of a diamond. Two diamonds of exact size can have very unequal value depending on their quality.
Deciding on carat size is really about striking a balance between size and quality, in the right budget.

The word carat is derived from the carob seed that were used to balance scales in ancient times.

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