The singer unveiled the song, which is produced by Benny Blanco and written by Sia, on radio stations worldwide yesterday.
It has now been confirmed on Rihanna's official Facebook that the release of 'Diamonds' in the UK has been moved to later this week, after originally being scheduled to come out in November.
It will put the single in a direct chart battle with One Direction's 'Live While We're Young'.
The 'We Found Love' star also tweeted a picture of all of the countries where the song has already hit the number one spot, adding: "Im floored and humbled! Thanks to everybody y'all are the greatest."
The single is the first cut from Rihanna's as-yet-untitled new album, which is expected to be released in November.
Listen to 'Diamonds' below: