Donald Trump has been doling out diamond cuff links to unsuspecting pals as presents — but they’re actually fabulous fakes, sources say. At least three recipients later learned that the glittery gifts were valuable only as mementos from Trump.

The real estate mogul pulled the same stunt on his mentor, famed late pitbull lawyer Roy Cohn, years earlier, according to another report. Trump gave Cohn a pair of “diamond-encrusted’’ cuff links and buttons in a box from famed jeweler Bulgari as a present, said the New York Times. Cohn’s partner, Peter Fraser, who inherited the items, said he later had them appraised, and they turned out to be knock-offs.

A Trump source told The Post on Tuesday that after The Donald engaged in a fake ringside take-down of wrestling honcho Vince McMahon in 2007, he griped to the promoter that he lost one of his “Trump-stamped’’ cuff links worth $50,000. The source said the links were actually valued at less than $100. But “that’s just Donald. It’s just very Donald,” said the insider, who heard the mogul tell the story.

Trump markets his own line of cuff links through his “Donald J. Trump Signature Collection’’ that are made of metal in China and go for as little as $39.99.