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black diamond

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noun
  1. carbonado1.
  2. black diamonds, coal.

Origin of black diamond

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for black diamonds

black diamond

noun
  1. another name for carbonado 2
  2. (usually plural) a figurative expression for coal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012