Activity of cutting, re-cutting, polishing, re-polishing, adjustment of precious stones, engraving of girdles, three-dimensional shapes and various glyptic works on precious, fine, ornamental and organic stones; expertise, control, identification, sorting, classification in the fields of gemmology, watchmaking, jewellery, goldsmithing, as well as all services in these fields; purchase, sale of crystals, minerals, precious, fine, ornamental, organic rough and cut stones.