Luminous rosette

Luminous rosettes were among the merchandise being sold by saleswizards at the 422nd Quidditch World Cup. They came in green or red (representing Ireland and Bulgaria respectively) and shouted the names of each teams respective members. The charms on them apparently were not designed to last very long, as Seamus Finnigan's rosette had already degraded to the point where its voice was "feeble and exhausted" by 1 September.