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Jewel showcase

Also celebrating a birthday this week is Jewel, whose TV series “Platinum Hit” debuts Memorial Day at 10 p.m. on Bravo. Aimed at the same crowd that made “American Idol” a smash, “Platinum Hit” will pit 12 singer-songwriters against one another, with Jewel serving as the host and “American Idol” veteran Kara DioGuardi acting as head judge.