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industrial diamond

British  

noun

  1. a small often synthetic diamond, valueless as a gemstone, used in cutting tools, abrasives, etc

"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

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Weakness in the industrial diamond market has added to the unit’s problems.

From The Wall Street Journal Feb. 20, 2026

It actually has the strength of an industrial diamond.

From New York Times May 2, 2012

The industrial diamond concession in northeastern Angola will produce less than half its prewar output of 2 million carats this year.

From Time Magazine Archive

For some of the miners who saw the stone said it was a rare gem worth $600,000 or more, but others scoffed that it was only an industrial diamond worth a bare $4,000.

From Time Magazine Archive

Two months ago, she suffered a humiliating defeat after suing General Electric on charges it conspired with DeBeers of South Africa to fix industrial diamond prices.

From Time Magazine Archive

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