For more videos, subscribe here: http://bit.ly/12EW5bu. Sia sings the song she wrote with Benny Blanco for Rihanna "Diamonds" and performs it with famed producers Stargate at the Norweigan-American Achievement Award ceremony - November 28, 2012. Follow Sia: http://www.facebook.com/SiaMusic http://www.twitter.com/Sia http://siamusic.net/