Shares of Signet Jewelers (NYSE: SIG) climbed 29.7% in the month of June, according to data from S&P Global Market Intelligence, after the diamond jewelry retailer announced significantly better-than-expected quarterly results. Most of Signet's gains came on June 6, 2018, alone, when the stock popped 18.4% after its quarterly report hit the wires.IMAGE SOURCE: GETTY IMAGES.The parent company of chains including Kay, Zales, and Jared grew revenue 5.5% year over year to just over $1.48 billion, albeit with roughly flat same-store sales as compared to the same year-ago period.