Diamond sleuth/salesman Bill Nusser proves that nice guys finish first1. What form of advertising has elicited the best response for you?For the past 12 to 13 years, I’ve been part of a panel for an intro to marketing class and upper-level marketing class at University of Iowa’s business school, speaking to nearly 400 students each semester. A lot of them have provided incredible insights and suggestions that I’ve put into action. Not a month goes by that one doesn’t come to the store. These students spend anywhere from $8,000 to $25,000 and have brought in several hundreds of thousands of dollars in bridal business over the past decade. 2. What was your finest hour in customer service? A valued and wealthy client had two daughters, one of whom shared her mother’s taste in fine jewelry. When the mother died, the daughter wanted her son to have his grandmother’s signature diam