Close but not quite! I've heard two versions of the answer. In Scotland it's a ripe hawthorn berry, in the Borders and Northumbria it's a ripe sloe fruit (otherwise known as blackthorn). Both plants have a purplish-red fruit when ripe, and both are gnarly twisty little trees, especially in the winds of the Highlands, (hence the 'hurple'). The stick is the stem, the stone is the seed.