Shares of jewelry retailers fell Wednesday after online jewelry retailer Blue Nile offered a weak outlook. Citing uncertainty in the luxury retail sector, the company said it expects first quarter and yearly earnings below expectations. Analysts said the luxury sector, once thought to be impervious to the economy, appears to be weakening. Tiffany Inc. and Coach Inc. have both warned of sales slowdowns. JMP Securities LLC analyst Kristine Koerber said guidance was disappointing.

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