Baylis & Harding Sweet Mandarin & Grapefruit Diffuser Set. A Luxury Sweet Mandarin & Grapefruit Oil Diffuser Set. Enhance your environment with these infusion sticks, delicately fragranced with zesty citrus scents. A safe and beautiful way to fragrance the home, the simple glass jar makes an elegant addition to interiors and the diffuser emits continuous fragrance to create an inviting ambience for your guests.