Life hasn’t been a bowl of cherries for Nagi Osta, but with his son’s help, it’s pretty darn goodAs a young adult, Nagi Osta worked with his brother at a seafood restaurant in Florida. His father dealt in antiques, including some age-old jewels, but the jewelry business was hardly top of mind. Until, that is, Nagi woke up one day and had a life-changing epiphany: He wanted to become a jeweler. Before opening his first store in 1980, Nagi worked with three retail jewelers and a diamond wholesaler. In 2002, he bought a three-story, 7,500-square-foot building in Stamford, Conn.; half the space was for the showroom. Of his three children, his son Jeffrey is the only one who works alongside him at NAGI Jewelers—though service manager Jeffrey wouldn’t mind having his older brother and younger sister there, too. “Having three family members who share in my parents’ vision and pass