Definitions for black diamond
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Random House Webster's College Dictionary
black′ dia′mond(n.)
Category: Mineralogy
Ref: carbonado1. 1
black diamonds, coal, esp. anthracite.
Category: Mineralogy
Origin of black diamond:
1910–15
Princeton's WordNet
carbonado, black diamond(noun)
an inferior dark diamond used in industry for drilling and polishing
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"black diamond." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/black diamond>.

