bort (bort) noun

   Poor-quality diamond, or diamond fragment, used as an industrial
   abrasive, as in grinding wheel.

[Possibly metathetic variation of brot, from Old English gebrot, fragment.]

   "Steve Issod ... estimated that 5 percent of the company's production is
   larger diamonds, with some over 20 carats and some fancy colors; 20-25
   percent gem quality; 60 percent near-gem quality; and the remainder bort
   utilized for industrial purposes."
   Juina Mining Corp. Will Begin Operation of Its Diamond Mining Facility,
   Business Wire (New York), Mar 5, 1999.

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Pronunciation:
http://wordsmith.org/words/bort.wav
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