Chinese Journal of Geochemistry

, Volume 10, Issue 3, pp 288–293

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

  • Tao Zhengzhang

DOI: 10.1007/BF02843332

Cite this article as:
Zhengzhang, T. Chin. J. of Geochem. (1991) 10: 288. doi:10.1007/BF02843332


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 seeds as a means of weighing an extremely valuable commodity is not very scientific. Before 1907, at various times and in various countries, there were at least twenty-three standards for the carat ranging from 187.00 mg to 215.990 mg.

The metric carat equal to 200 mg was proposed in Paris in 1907. It was adopted in the United States on July 1, 1913 and now is the world-accepted standard. But in reality, the standard of the carat is still confused with respect to its usage throughout the world. This is why the author reiterates that the standard of the carat should be integrated with the metric system.

Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1991

Authors and Affiliations

  • Tao Zhengzhang
    • 1
  1. 1.Chengdu College of GeologyChengdu

Personalised recommendations