Columbia shot only 26 percent in the first half and missed on all eight of its 3-point tries in falling behind 34-17, the fewest points given up in a half by the Tigers this season.
Stephens grabbed 13 boards in posting his fifth double-double this season and third in a row against Ivy opponents. Ryan Schwieger added 15 points and Jaelin Llewellyn 10 with Richmond Aririguzoh grabbing 11 rebounds to go with seven points.
Patrick Tape scored 12 points and Quinton Adlesh 11 for the Lions (6-11, 1-2), who finished 2 of 18 from the arc and 30.5 percent overall. Princeton only shot 36 percent but outrebounded the Lions 48-31.
Columbia didn't get closer than seven in the second half in game they trailed in from the outset.