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However, for a given quality of diamond, the price will rise exponentially as the stone gets larger. For example, a 4 carat stone is worth far more that double that of a 2 carat stone of the same quality.
This exponential increase is for the simple reason that larger the stone gets, the harder it is to find.
Cut | Clarity | Colour
The weight of a diamond is expressed in 'carats'. One carat is equivalent to 0.2 grams.
Within the trade, one carat is divided into one hundred units called points; a stone weighing 0.64 carats would be referred to as a '64 pointer'.
It is vitally important to take into account all four C's when choosing your diamond. Larger doesn't necessarily mean better. A large stone will not be very valuable if it is cut badly or is of a low grade colour.