Bort
Shards of non-gem-quality diamonds / From Wikipedia, the free encyclopedia
This article is about the mineral or gem. For other uses, see Bort (disambiguation).
"Boart" redirects here. For the mineral exploration company, see Boart Longyear.
Bort, boart, or boort is an umbrella 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 or 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][3]