House point hourglasses

The House points hourglasses are located in the entrance hall. They record the number of house points that have been awarded or deducted. There are four giant hourglasses; one for each Hogwarts houses (Gryffindor, Hufflepuff, Ravenclaw and Slytherin. the Slyhterin hourglass was shattered in 1997 during the Battle of Hogwarts and green emeralds rolled across the floor. It was probably repaired and remounted on the wall.

When points are earned some gems (depending on house colours) fall from the upper bulb into the lower. When points have been deducted, they do the opposite retreating into the upper.