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All About Lady Gaga S Tiffany Diamond Necklace And Why She Was Chosen To Wear It Lady gaga wore the 128 carat tiffany diamond to the oscars this weekend, where she was nominated for best actress and performed her in 1972 tiffany placed a possibly tongue in cheek ad in the new york times offering it for $5 million (about $25 million today) to anyone who could come.