Sia has said that she wrote Rihanna's hit single 'Diamonds' at the singer's studio in 14 minutes.

Benny Blanco, the song's co-writer and producer, described the speed with which the song was written as "insane".



The Australian singer also told The New York Times that Rihanna stuck strictly to the original demo vocals of the song, using Sia's vocals as a guide and recreating the same inflections.

When Blanco played Rihanna's recorded version of the song back to Sia, the songwriter mistook the vocals for her own.

She said: "We listened to it on his iPod, sitting on a sofa at ABC Carpet and Home in New York.

"I literally punched him in the arm. I thought Benny was playing a trick on me. She could've done it her own way, but I think she really genuinely liked the way it was."

'Diamonds' was released in 2012 from Rihanna's seventh studio album and became a best-selling single.

Watch the video for the song below:

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