Judge Yogesh Khanna concluded the hearings yesterday after defence and prosecution lawyers completed their final arguments.
AP Singh, a lawyer for two of the defendants, said: "The judge has said he will give his verdict on September 10."
The 23-year-old medical student victim and a male friend were attacked when they boarded a private bus after watching a movie at a shopping mall last December.
Six attackers beat the man and raped the woman, inflicting massive internal injuries. The victims were dumped on the roadside and the woman died two weeks later in hospital.
One of the accused was found dead in his jail cell in March and a juvenile defendant was sentenced on Saturday to three years in a reform home.
The four remaining men face possible death penalties. The assault caused nationwide outrage and forced the government to change rape laws and create fast-track courts for rape cases.
As well as tougher sentencing powers, the new law also makes stalking, voyeurism and sexual harassment a crime.