Diptyque Car Diffuser with Orange Blossom Insert Elegant and sophisticated, the Diptyque car diffuser uses an innovative system of cold diffusion. Simply attach to your car's ventilation grill to diffuse the sublime scent of Fleur d'oranger/Orange Blossom, a blend of the bark, leaves, and fruit of the citrus tree. Designer About Diptyque: When celebrities travel to Paris, they flock to the Left Bank to stock up on Diptyque candles. Diptyque produced its first handmade candles in 1963, infusing.