Learn English – Only diamond can cut diamond (idiom to show equality, only match)

idiom-requests

Is there an idiom which implies that the only match of a certain entity is another entity of the same kind, with some sort of 'sordidness' in the entities?

Paul is a seasoned bluffer. Ron can't handle him, only George can. Only diamond can cut diamond

Perversion here is Paul and George (implied) being bluffers.

I am NOT looking to use it in the following sense:

Paul is a good wrestler in 200kg category. Ron is a champion of 300kg category but he cannot handle him, only John can.

EDIT:

I'm looking for a replacement of 'only diamond can cut diamond' in the above sentence.

Perversion -> sordidness

phrase -> idiom

Also, I like @silenus's answer: "It takes a thief to catch a thief", its perfect based on my initial question but is there a idiom where the entity being used as a comparison doesn't imply any sordidness on its own? e.g. Diamond is neutral but thief, not so much.

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