Warren Gurney was the son of Joseph Gurney of Rockland, Massachusetts. During the war, Warren was a bandmember of the 56th Massachusetts Regiment, serving occasionally as a field hospital aide. After the war, Warren entered the jewelry business with his brother Lysander, and together they formed the Gurney Brothers Jewelers of Brockton, Mass., a firm which was still flourishing in the 1960s.
According to a brief obituary published in the New York Times, Gurney died suddenly in his sleep on June 19, 1896. The cause of death was thought to be apoplexy. He was then 57 years old.