From the Lucas County Marriage Index, volume 26, page 208, application #20560: Marriage Application, Probate Court, Lucas County, Ohio. In the matter of Irvine Diamond and Opal Barnes.
Irvine Diamond is 21 years of age on the 17 day of March 1913, his residence is 304 Hanover St, Toledo, Ohio, his place of birth is Toledo, Ohio, his father's name is Herbert Diamond and his mother's maiden name was Mina Ellenor and he was not previously married.
Opal Barnes is 19 years of age on the 4 day of June 1913, her residence is Swanton, Ohio, her place of birth is Swanton, Ohio, her father's name is Charles Barnes and her mother's maiden name was Louise Dennis and she was not previously married.
It is expected that Rev. N. E. Dennis will solemnize the marriage of said parties. Signed, Irvine Diamond, Signed Opal Barnes. Sworn to and before me and signed in my presence this 15th day of Sept. 1913. Signed, C. L. Conlisk, Deputy Clerk Probate Court.
Marriage Certificate #20560 I do hereby certify that on the 17th day of September A.D. 1913, I solemnized the marriage of Mr. Irvine Diamond with Miss Opal Barnes. Signed, Rev. N. E. Dennis, U.B. Minister, Swanton, Ohio.
Edit: Rev. Dennis was Norris E. and I believe he was Opal's uncle. He and Louise were the c/o David and Nancy DENNIS, living in Spencer Twp., Lucas, OH in the 1870 census.