COMINGS AND GOINGS>>?Stuller chief operating officer Jay Jackson was named president and CEO, the Lafayette, La.–based jewelry manufacturer announced March 28. Company founder Matthew Stuller returns to the position of chairman. Stuller also made the following executive changes: Harold Dupuy, formerly chief merchandising officer, has been named to the newly created position of vice president of strategic analysis. Danny Clark is now chief merchandising officer, succeeding Dupuy; Clark was formerly chief supply chain officer. Coby Blanchard, formerly the executive director of production operations, succeeds Clark as chief supply chain officer. Grady Quebedeaux assumes another new role: executive director of information technology.>>?Joshua J. Fine Jewelry announced March 10 the appointment of Peter Cotton as western regional sales manager. Cotton will be working with guild r