Gugu Mbatha-Raw It may have been February, but the Concussion actress breezed into the NAACP Image Awards like a ray of summery sunshine. While her cutout Narciso Rodriguez gown was definitely daring, the marigold shade dialed up the sweetness factor. And the yellow gold and turquoise jewelry (courtesy of California girl Irene Neuwirth) provided a playful—and colorful—contrast.     ON MBATHA-RAW (Inset) 18k yellow gold cuff with Kingman turquoise; price on request; Irene Neuwirth, Venice, Calif.; 310-450-6063; ireneneuwirth.com   UNDER $15,000 18k gold bracelet with 30.69 cts. t.w. Sleeping Beauty turquoise and 1.7 cts. t.w. ideal-cut diamonds; $13,246; Yael Designs, San Francisco; 415-989-9235; yaeldesigns.com   UNDER $500 Goddess Stone cuff with oval-shape turquoise cabochon in 24k gold–plated bronze; $485; Stephanie