Jorge Adeler, co-owner of Adeler Jewelers in Great Falls, Va., had always hoped his two daughters, Wendy and Valentina, would join the business he started with his wife, Graciela, in 1975. The sisters grew up in the store; as little girls, they sorted gemstones under display cases and trailed their parents around trade shows. So it seemed unfathomable to Jorge that, even as adults, they would ever work elsewhere. “I admire my American customers for having the spirit of sacrifice,” he says. “To actually leave the kids to be free and successful on their own—I don’t have that open-mindedness. I never, ever want them to be far.” The Argentinian-born retailer and jewelry designer’s ­ultimate wish came true in the 1990s when both daughters, following a period of professional exploration, returned to work full time at Adeler Jewelers. Wendy, the vice president of ­marketing and