It changes color, depending on how far the end of the Queste is. Alther Mella recited a poem to Septimus about the colour of the Questing Stone - Tertius Fume usually Caused apprentices to draw the Questing Stone. There were 21 Stones and the last one was drawn by Septimus Heap in Queste. One was also drawn by Syrah Syara. It is revealed in Fyre that Septimus still has it. Septimus drew the last stone and that the ghost of DomDaniel had Disappeared, that that was the last ever Gathering of Ghosts - as Hotep-Ra made only 21 Stones.