Was it Professor Plum in the study with the revolver, Brigitte Giraudi with a playful penchant for the nostalgic, or you on the prowl for that perfect conversation piece? We suspect all three. Inspired by the timeless board game of crime and deceit, Monacoan designer Giraudi’s line of Miss Bibi jewelry is wonderfully whimsical. The intricate accessories — scaled down and glammed-up replicas of household items — turn mundane into magical. Lure potential admirers with a bejeweled telephone ring, dictate the passing hours with dangly clockwork earrings, or prove you mean business with a rifle brooch pinned by your heart. That oughta give them a clue. Available at The Achilles Project, 283 Summer Street (617-423-2257 or achilles-project.com); online at missbibi.com.