How onetime wholesaler Peter Pritsker parlayed his love of diamonds into a family businessPeter Pritsker, co-owner of Cranston, R.I., fine jewelry store Providence Diamond, fell in love with the diamond business long before he became a retailer. The 71-year-old built his jewelry career on the wholesale side—notably at M. Fabrikant & Sons, which was the largest diamond wholesaler in the United States in the 1980s. “At the time, M. Fabrikant didn’t have a New England sales rep,” Pritsker recalls. “So I approached the owner at a convention and he agreed to a trial period at $200 a week draw. Even then, it wasn’t a lot of money.” But the soft-spoken salesman didn’t disappoint, and eventually cultivated a large clientele. As the ’90s began, Pritsker and his wife, Marcia, decided to take the leap into retail by opening a small shop in Warwick, R.I. Soon after, the store d