Diane King Hall says "diamonds are still a girl's best friend" as Signet Jewelers (SIG) topped earnings and raised full-year guidance. She notes the possibility for further growth as more couples are expected to become engaged in the months ahead. Kraft Heinz Co. (KHC) traded lower on plans to split the company into two publicly traded entities. Meanwhile, Diane notes a rally in PepsiCo (PEP) as Elliott Management pushes for changes in the company.