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What is the history of carats?

Published in Gemstone Measurement 1 min read

The history of the term "carat" is rooted in ancient times, specifically in the use of natural objects for measurement. The word carat itself, used to describe the weight of a diamond, has a fascinating origin.

Origin of the Word 'Carat'

The term carat originates from the scientific name of the Carob tree, Ceratonia siliqua. This connection highlights an ancient practice among diamond traders.

How Carob Seeds Were Used

In ancient times, before standardized scales and precise units of mass were widely available or used for small, valuable items like diamonds, traders needed a way to compare weights. They turned to the seeds of the Carob tree.

  • Natural Consistency: Carob seeds were believed to have a remarkably consistent weight.
  • Method of Comparison: Diamond traders would compare the weight of a diamond directly to a specific number of Carob seeds.

This natural, readily available method provided a rudimentary standard for assessing the size and therefore, implicitly, the value of diamonds in an era without modern weighing technology. This practical historical link solidified the connection between the Carob seed and the unit of weight we now call the carat.