industrial diamond

World English Dictionary
industrial diamond
 
n
a small often synthetic diamond, valueless as a gemstone, used in cutting tools, abrasives, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

industrial diamond

any diamond that is designated for industrial use, principally as a cutting tool or abrasive. In general, industrial diamonds are too badly flawed, irregularly shaped, poorly coloured, or small to be of value as gems, but they are of vital importance in the modern metalworking and mining industries. Their utility stems from the fact that diamond is the hardest natural substance known.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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