Blue Glass Diffuser Silver Collar. The beautiful blue glass diffuser has a sterling silver collar. The Blue glass Diffuser comes with a set of wooden reeds and is ready for you to add your own favourite diffuser oil. The blue glass diffuser has a marbled effect in the glass which adds to it`s beauty. The size is approx. 120 mm high by 100 mm in diameter. The sterling silver collar has been handcrafted by our silversmith and is fully hallmarked. Presented in a smart gift box.