Model: MUGBHP15 Stoneware 350 ML Ravenclaw crest Mug HARRY POTTER Mug Ravenclaw Crest. This Harry Potter mug is a great way to add a little fun to the home. It features the blue and bronze Ravenclaw crest on one side and the Hogwarts crest, which features all four houses, on the other. This mug comes in an open gift box. A perfect gift idea for a true Harry Potter fan.