The Singadias built their Atlanta superstore on years of internationally sourced jewelry expertiseThe Singadias’ ties to the jewelry and watch trade span three generations and four continents: Nanji Singadia’s father, Khimji, repaired watches and sold parts in India and then in Kenya. Not surprisingly, Nanji went into the watchmaking trade as well, eventually opening a shop in London in 1970 and another in 1972. A decade later, after visiting a friend in Atlanta, he moved the family—and the family business—to the United States. He and his wife, Pushpa, opened three ­jewelry stores before their son, Ajay, joined them behind the counter in 1995. When daughter Rakhi came on board, Nanji made another big move: building a strip mall with his 6,000-square-foot Barron’s Fine Jewelry superstore as the anchor. That was in 2004; today, Barron’s is one of the Atlanta area’s leadin