Origin
This proverb originated in 1876.
Explanation
It refers to two people equally matched in wit or cunning.Diamond is the hardest substance known; a diamond can be cut only by another diamond. The phrase refers to opponents who are an equal match in wit, cunning or strong-mindedness. Any conclusion reached is not without mutual injury. Diamond is the hardest natural form of carbon, so you need another diamond in the cutting tool to cut it.
Example
Seeing the over-confidence of his friend, he too changed his nature. Diamond cuts diamond.
My uncle is a genius. My father is also a man of letters. Diamond cuts diamond.
Mr. Sharma was an expert orator. His oppoment was also good at public speaking. Diamond cuts diamond.
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