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n. Poorly crystallized diamonds used for industrial cutting and abrasion.

n. A carbonado.

n. Poor quality diamond, used for industrial cutting or abrasion; a poorly crystallized diamond.

n. Imperfectly crystallized or coarse diamonds, or fragments made in cutting good diamonds which are reduced to powder and used in lapidary work.

n. A collective name for diamonds of inferior quality, especially such as have a radiating crystallization, so that they will not take a polish.

n. An amorphous variety of diamond, brown, gray, or black in color, and known also as black diamond or carbonado, found massive in Brazil in association with pure diamonds.

"The black diamonds, called bort, are used mainly for arming diamond drills and for polishing other diamonds."

dutch bort   

Court    Dort    Mort    Porte    Stuart    abort    assort    athwart    boart    cavort   

fraa    claire    foglamp    compte    burt    sigler    satte    l'ajout    hundre    busk