(IDEX Online) - A teenager collected a jacket from his school's clothing donation program . . . and found two diamond rings, two Gucci watches and an emerald bracelet inside a pocket.Luke Coelho, 17, from Worcester, Massachusetts, USA, set about tracing the rightful owner. Thankfully the jacket bore the name Dave and the logo of a uniform services company.They were the clues that allowed Luke, recently moved from Brazil, and his aunt, to turn detective.The watches and jewelry, valued at $20,000 were later reunited with owner Dave Kenney, a retired truck driver who said his late wife must have hidden the haul.Screengrabs, courtesy CBSBoston.com, show Luke wearing the jacket and the diamond rings.