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So...What exactly is a Carat, Anyway? - Heart In Diamond
What is a Carat? A carat is a unit of measurement equal to 0.2 grams. The term originates in ancient times, back when the seed of a carob tree was used as the standard measure of weight for precious stones. Of course, not every seed weighed the same–which lead to serious problems from time to time! In order to end such disputes and discrepancies, the carat was formally adopted into the metric system in 1913. And there are many different diamond types...
Carobs and Carats - Heart In Diamond
Where Did Carats Come From? The measurement unit “carat” can be traced back by historians to the mid 15th century, when seeds from the Ceratonia silique shrub (often referred to colloquially as the “carob tree”) were used as a reference in order to measure the weight of valuable materials such as diamonds and gold. It was thought that these carob seeds offered an unusually low variation in mass, but modern research has largely dispelled that myth....