Watch Sia Perform A Breathtaking Cover Of Rihanna's "Diamonds" (Which She Wrote!)

Did you know that Aussie musician Sia (the one featured in "Titanium" with David Guetta, and "Wild Ones" with Flo Rida) wrote Rihanna's latest single "Diamonds"? Well now you do, you're welcome! Recently, the singer-songwriter got on stage to perform her own version  of "Diamonds" at the Norwegian-American Achievement Awards ceremony.

Watch above to see Sia's stunning rendition (her vocals are a little stronger than Riri's, no offence!) of the dramatic song.

Whose version of "Diamonds" do you like better? Tell us in the comments!