With trappings like this, who could say no? Diamond.com snared Laetitia Casta, one of Victoria's Secret's favorite models, for its first advertising campaign. The print effort from Messner Vetere Berger McNamee Schmetterer/Euro RSCG, New York, for the online purveyor of loose diamonds, watches and jewelry breaks in October issues of upscale magazines such as Fast Company, In Style and Town & Country. International newspaper, banner and out-of-home ads will follow. Copywriter: Matt Sherring. Art director: Simon Macrae.