Detectives in Brooklyn need the public’s help in finding two violent crooks who ambushed a couple outside a jewelry store and stole tens of thousands of dollars from them. The NYPD released on May 12 video footage of the suspects sought for the caper, which occurred on the afternoon of May 10 near the Star Jewelry store at 44 Graham Ave. in East Williamsburg. According to police, the two victims — a 30-year-old woman and a 50-year-old man — shopped for jewelry at the location at about 2:44 pm that day. One of the suspects was inside the store as they browsed items. A few minutes later, authorities said, the perpetrator followed the pair out of the store, and was …