RAPAPORT... Actress and singer Lady Gaga sported a 128.54-carat yellowdiamond and platinum Tiffany necklace at the 91st Academy Awardsshow Sunday night. The Oscar winner wore the 141-year-old cushion-cut TiffanyDiamond - which originated in the Kimberley mines in South Africa - was last seen on Audrey Hepburn at the publicity shoot for the 1961 movie Breakfast at Tiffany's. It's the first time the diamond has featured at an awards-showred carpet, Tiffany noted. "Lady Gaga is the ultimate creator, innovator and rule-breaker,and I'm thrilled that she will be wearing the legendary Tiffany Diamond on theawards-show red carpet for the first time since it was discovered," Tiffanychief artistic officer Reed Krakoff said Sunday. The A Star is Born performer also worefancy-vivid-yellow and white diamond earrings. A number of other celebrities were spotted wearingplatinum jewelry at the awards show. Amy Adams debuted a platinum Cartier clipbrooch with diamonds, while Laura Harrier sported a diamond, emerald andplatinum Bulgari necklace. Jennifer Hudson, Sarah Paulson, Helen Mirren andLaura Dern all chose platinum-and-diamond Harry Winston jewels. Image: Lady Gaga wearing the 128.54-carat Tiffany Diamond necklace. (Platinum Guild International)