Signet topped estimates in its latest earnings report.Signet Jewelers (SIG -2.12%) is the world's largest retailer of diamond jewelry. It's also an attractive value stock that has jumped 400% over the last five years as the company cut costs and adapted its business model to the digital era.After surging in the late stages of the pandemic, benefiting from stimulus packages that gave consumers money to spend, Signet had struggled through 2023 and 2024 as comparable sales declined due in part to a delay in en ...