Abstract: A modular element for making jewellery items, trinkets, and the like, having a convex outer surface and a through hole arranged at the top of the outer surface, where a wire, chain, or support for making the jewellery item, trinket, and the like can be inserted through the through hole, a main axis of symmetry passing through the hole, including a concave inner surface intended to at least partially accommodate the outer surface of a second element adjacent to the first one, where the outer surface can be inscribed on a rotation surface whose generatrix is an arc of a conic section and whose axis of rotation coincides with the main axis of symmetry. Embodiments also include a jewelry item.