Sergio (carbonado)

Sergio (Portuguese: Carbonado do Sérgio) is the largest carbonado and the largest rough diamond ever found.[1] It weighed 3,167 carats (633.4 g; 20.36 ozt) and was found above ground in Lençóis (State of Bahia, Brazil) in 1895 by Sérgio Borges de Carvalho. Like other carbonados it is believed to be of meteoritic origin.[2][3][4][5][6][7][8][9]

Sergio was first sold for $16,000 and later for $25,000 to Joalheria Kahn and Co. and shipped to G. Kahn in Paris, who sold it to I. K. Gulland of London in September 1895 for ₤6,400. There, it was broken up into small 3-6 carat pieces as industrial diamond drills.[10]

See also

References

  1. ↑ William, Stephen E. (Summer 2017). "Carbonado Diamond: A Review of Properties and Origin". Gemological Institute of America. Retrieved 4 April 2018.
  2. ↑ "Carbonado - A possible relic from Uranus or Neptune". meteoritestudies.com. Retrieved 15 February 2013.
  3. ↑ Wikisource Rudler, Frederick William (1911). "Carbonado". In Chisholm, Hugh. Encyclopædia Britannica. 5 (11th ed.). Cambridge University Press. p. 307.
  4. ↑ Broad, William J. (17 September 1996). "Giant Black Diamonds Of Mysterious Origin May Hail From Space". New York Times. Retrieved 4 April 2018.
  5. ↑ Diamonds in the Sky
  6. ↑ Ralf Tappert, Michelle C. Tappert "Diamonds in Nature: A Guide to Rough Diamonds", p. 41
  7. ↑ Mark A. Prelas, Galina Popovici, Louis K. Bigelow (eds.) "Handbook of Industrial Diamonds and Diamond Films", p. 484
  8. ↑ G.J.H. McCall, "The carbonado diamond conundrum" Archived 2014-02-21 at the Wayback Machine.
  9. ↑ R.A. Ketcham, "New textural evidence on the origin of carbonado diamond: An example of 3-D petrography using X-ray computed tomography" Geosphere, GES00908.1, first published on August 14, 2013
  10. ↑ Herold, Marc W. (April 2013). "The Black Diamonds of Bahia (Carbonados) and the Building of Euro-America: A Half-century Supply Monopoly (1880s-1930s)" (PDF). University of New Hampshire. p. 12. Retrieved 4 April 2018.


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