Sweeps Redken Diamond Oil SamplingPlease enter the current Sweepstakes instead of this expired one. Enter once for a chance to win the Redken Diamond Oil Sampling Sweepstakes. Open to legal residents of the continental U.S. There will be 12,000 winners of a trial kit of Redken Diamond Oil products. Thanks to Coupon Pro for sharing! This sweeps started June 1 and ends July 31 which breaks down to about 197 winners per day.