Question: What is the name of this song recorded by Barbadian singer Rihanna for her album "Unapologetic", in which she worked with Anthony Mandler on the music video?
Sentence (from "Diamonds (Rihanna song)"): The song's lyrics serve as a departure from the themes of unhealthy relationships that were on Rihanna's previous singles and contain a prominent concept of love.
Relevant evidence: No