Origin of Carat:From Carob Seeds to Carats
Posted by aloysiushan on December 15 2009 20:12:47

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The following paper studies the variability in the mass of a carob seed, and explores the history behind how it became to be used as the standard for stone weight.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1686184/