St. Lawrence's Chera Marshall, assisted by Amanda Sargeant and Shannon Smith, rounded out the scoring with a goal at the 18:15 mark of the third, for the final score 7-3.
The contest was a good warm-up for the Crimson, who outshot the Saints 38-29 and dominated much of the game.
"We put people on their heels today," said Stone, adding that the team will prepare for Dartmouth the same way they readied for St. Lawrence. "We concentrate more on our game, on our strengths, than what others do to us."
"We've had our ups and downs, but that happened early on," Ruggiero added. "But we have momentum now and we are building confidence game by game. Our team knows what it feels like to win it all, and we want to have that feeling again."
In other action, No. 1 seed Brown defeated No. 8 seed Niagara 5-0 and No. 5 seed Northeastern upset No. 4 seed New Hampshire 4-3. The winner of the Dartmouth-Harvard semifinal will face either Brown or Northeastern in Sunday's conference title game.