[1] Born in Burgettstown, Pennsylvania, Diamond was in the United States Navy from 1946 to 1948.

He was an Assistant United States Attorney of the Western District of Pennsylvania from 1961 to 1963.

He was the United States Attorney for the Western District of Pennsylvania from 1963 to 1969.

[2] Diamond was nominated by President Jimmy Carter on March 22, 1978, to the United States District Court for the Western District of Pennsylvania, to a seat vacated by Judge Edward Dumbauld.

[2] Diamond died on October 30, 2021, at his home in McMurray, Pennsylvania, at the age of 93, following 43 years of judicial service.