...+ Diamond and specialty jewelry retailer Signet Jewelers Ltd. recently lowered its sales and earnings guidance for fiscal 2019 (ending on Feb. 2, 2019) following weak operating performance during the holiday season. + We expect performance to remain soft in fiscal 2020 (ending February 2020) stemming from heightened competition from department stores and other retailers with more attractive product and price offerings. + As a result, on Jan. 25, 2019, S&P Global Ratings lowered the issuer credit rating on Signet to '##' from '##+'. The outlook is negative. We also lowered the issue-level rating on the company's $400 million senior unsecured notes due in 2024 to '##' from '##+'. The '3' recovery rating on the debt is unchanged. + The negative outlook reflects the potential for a lower rating if Signet's business prospects weaken further, causing continued margin deterioration....