Akron, Ohio—Signet Jewelers Ltd. is heading into the holiday season with a positive outlook after a promising second quarter, raising its full-year same-store sales guidance.For the quarter ended Aug. 1, Signet’s sales totaled $1.53 billion, down slightly year-over-year from $1.54 billion in the prior year period. Same-store sales ticked up 2 percent.Gross margin was $602.4 million, or 39 of sales…

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