COMINGS AND GOINGS >>?Brad Brooks-Rubin, former special adviser for conflict diamonds for the U.S. Department of State, has joined the GIA as global director of development and beneficiation. >>?Industry vets Sam Ziefer and Jeffrey Sadowsky have joined recycled diamond and ­jewelry company White Pine Trading. Ziefer, who formerly led CIRCA’s retail division, will expand White Pine’s national jewelry buyback program. Sadowsky, former acquisition director of GBC, will focus on increasing its jewelry footprint. Rita Jammet >>?French jewelry house Mauboussin appointed Rita ­Jammet interim North American CEO. Jammet, who has a restaurant background, replaces Thierry Chaunu, who took the position last August. The company has also closed its New York City boutique, which opened on Madison Avenue in 2008, and plans to open a smaller location in Manhattan.