Diamonds and gold are king at this Steel City mainstay “It would be wrong for a father to have a child in the business only because they are his child,” muses Jack Henne, the semi-retired patriarch of Pittsburgh-based fine jewelry store Henne Jewelers. “The owner has to feel confident that their child is capable,” he explains. “And if they’re not, it’s better to not start the process.”When it came to handing over the business to his son, John, Jack says he couldn’t have felt more certain of his son’s abilities to grow the family ­business that his grandfather, Rudolph Joseph Henne, founded in 1887. “I just think, all around, he’s my hero,” adds the 83-year-old, who still works in the store a few days a week. “His character, the way he treats employees and customers—he’s just excellent all around.”MODERN HISTORYJack: The business is evolving much more no