It's Rihanna's New Single "Diamonds"
Sia wrote "Diamonds" (it was produced by Stargate and Benny Blanco), and the lyrics therefore display a bit more maturity — and far less of a sexual overtone — than RiRi's more recent offerings. The mid-tempo beat reminds me of slower '70s disco like "Love To Love You Baby" for some reason.
Anyway, really loving this track. Nice switch-up for Rihanna. Don't fuck it up with the album like you did with that grating pile of cack Talk That Talk, though, hooker.