What is the meaning of black diamond?

noun

  • An inferior dark diamond used in industry for drilling and polishing.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). black diamond. Retrieved September 26, 2026, from http://smartdefine.org/black_diamond/definitions/1260576
ChicagoWordNet. 2010. "black diamond" http://smartdefine.org/black_diamond/definitions/1260576 (accessed September 26, 2026).
HarvardWordNet 2010, black diamond, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/black_diamond/definitions/1260576>.
MLAWordNet. "black diamond" 23 October 2010. Web. 26 September 2026. <http://smartdefine.org/black_diamond/definitions/1260576>