A Diamond District jeweler was shot in the neck outside his posh Brooklyn home, according to police and a report.

The 44-year-old man, whose name was not released, was shot just before 9 p.m. Thursday while arguing with another man in his driveway on Whitman Drive in Mill Basin, cops said.

The gunman then jumped in a Toyota and drove off southbound, cops said.

It was unclear what argument was about, according to police.

The jeweler was taken to Kings County Hospital, where he was expected to survive.

Family members told AMNY that the jeweler runs a shop in the famed district, on West 47th Street, off Sixth Ave.