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A mixture of bort and gem diamonds (larger inclusions) from the Crater of Diamonds State Park
Bort-like heavily twinned diamond from Congo

Bort, boort or boart is a term used in the diamond industry to refer to shards of non-gem-grade/quality diamonds. In the manufacturing and heavy industries, "bort" is used to describe dark, imperfectly formed/crystallized diamonds of varying levels of opacity. The lowest grade, "crushing bort," is crushed by steel mortars and used to make industrial-grade abrasive grits. Small bort crystals are used in drill bits. The Democratic Republic of the Congo provides 75% of the world supply of crushing bort.[1][2]

See also[edit]


  1. ^ Spear, K.E; Dismukes, J.P. (1994). Synthetic Diamond: Emerging CVD Science and Technology. WileyIEEE. p. 628. ISBN 0-471-53589-3. 
  2. ^ industrial diamond. Encyclopædia Britannica