Just like all gemstones, the weight of a diamond is measured in carats. A carat is a metric unit of measurement that is exactly 1/5 of a gram (0.20). That means there are 5 carats to a gram. A carat is divided into 100 points (like pennies in a dollar).
While some people think bigger is better, no one can argue the fact that bigger means more expensive if all other factors are equal.
The carat weight of a diamond can also be related to a stone's rarity. It is much harder to find a rough diamond that will yield a one-carat stone than it is to find two rough diamonds that will each produce a 0.50-carat diamond. Because of this, a one-carat diamond is substantially more expensive per carat then a half-carat stone. As the diamond increases in size the per carat prices increases exponentially instead of proportionally.
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