Diamond Carat Weight
How to Choose a Diamond
As with precious stones, the weight of a diamond is expressed in carats. The word carat originated in a natural unit of weight: the seeds of the carob tree. Diamonds were traditionally weighed against these seeds until the system was standardized and one carat was fixed at 0.2 grams (one fifth of a gram). One carat is divided into 100 "points" so that a diamond of 25 points is described as a quarter of a carat (0.25 carats).
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