House hourglasses at Hogwarts are filled with gems. Gryffindoors have rubies, Ravenclaws have sapphires, Slytherines have emeralds, and Hufflepuffs have diamonds. Because Hufflepuffs are diamonds, some a little rougher than others.
31 Unbelievable Facts That Make the Harry Potter Movies Even More Magical. I haven't come across an article with new Harry Potter facts in a long time, I'm so proud to call this a pin in my collection.