Martina McBride is joined by Keith Urban on this song. She told The Boot regarding the collaboration. "We found 'Diamond,' and we were sitting around thinking, 'This would be a great song to have a guest vocalist on.' It would lift it up even another step.
We thought of Keith Urban, and I texted him and asked if he could do it, and he made time in his crazy-busy schedule with American Idol and his own records."
McBride said regarding the lyrical content: "'Diamond' is for myself, and it's for my girls, and I think everybody out there."