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That's a bona fide diamond!
bona fide means authentic, real.
Bona fide or in bona fide if you want to emphasize.
Badges will only be sold to bona fide law enforcement officers presenting valid ID cards from issuing agency!
Bona fide can mean:
1. real or genuine: It was a bona fide example of his hand writing
or
2.undertaken in good faith: He made a bona fide offer to buy the house.
A bona fide offer was made to purchase the company.