Signet Jewelers Ltd. shares are down 7.1% in Thursday trading after reports that an investment newsletter raised questions about the company's credit operations and gem quality. Signet did not immediately respond to a request for comment. In its fiscal first-quarter report released last month, Signet said it has hired Goldman Sachs as a financial advisor as it conducts a strategic evaluation of its credit portfolio. Signet shares are down nearly 26% for the year to date while the S&P 500 is up 2.5% for the same period.
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