'Herbs for Spells' cauldron SMALL plant pot, black with green text and white stars. Made from resin. The small one really is quite small, and is pictured with the Green Witch cauldron mug for comparison: it's  H10cm x W12.5cm x D10cm and 320g.
(The large one is nice and large, at H17.5cm x W21cm x D21cm and 750g)