Tourmaline is one of the most famous semi-precious gem in  the world. The variety of colors is stunning. Some are very common as the black Schorl, but some varieties are highly prized by jewellery, some other come from only one source and are very scarse. The collection brings together most of members of the group, among them the rarest as Vanadium and USambara dravite, the Paraiba and the Fluor-Lidicoatite.