Signet hopped over a low bar in its second-quarter earnings report. Shares of Signet Jewelers (SIG 14.46%) were shining bright today as the world's largest diamond jewelry retailer posted better-than-expected results in its second-quarter earnings report. As of 10:10 a.m. ET, the stock was up 15.1% on the news. Signet is turning around Signet has struggled for the last several quarters amid broader sluggishness in consumer spending and a delay in engagements. The company has also faced difficult comparisons ...