Signet Jewelers Ltd. is, as of 2015, the world's largest retailer of diamond jewellery. The company is domiciled in Bermuda and headquartered in Akron, Ohio, and is listed on the New York Stock Exchange. The group operates in the middle market jewellery segment and has number one positions in the US, Canada and UK speciality jewellery markets. Certain brands operate in the upper middle market. Signet Jewelers owns and operates the companies Blue Nile, Zales, Kay Jewelers, Jared, JamesAllen.com, and others. Wikipedia