On the origin of the carat as the unit of weight for gemstones

  title={On the origin of the carat as the unit of weight for gemstones},
  author={Tao Zhengzhang},
  journal={Chinese Journal of Geochemistry},
  • Tao Zhengzhang
  • Published 1991
  • Geology
  • Chinese Journal of Geochemistry
  • The carat is the unit of weight for diamonds and other gemstones. It corresponds to the average weight of the seeds of a leguminous tree. What kind of tree is this? We have studied the samples from Ethiopia. Egypt, Cyprus and the United States. The tree is neither “Kuara” nor “Locust” (Robina pseudoacacia Linn.), but rather Carob (Ceratonia Siliqua). In Ethiopia, as called by local inhabitants, “Kuara” is a species of Erythrina—E. brucei rather thanE. abyssinica.As might be expected, using the… CONTINUE READING
    Seed size variability: from carob to carats
    • 22
    • Highly Influenced
    Year : 2006 Seed size variability : from carob to carats


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