Method for assembling a stone on a setting support, said stone being cut to exhibit a table, a crown, a girdle and a pavilion, said assembly method comprising the following steps: a) providing a substrate comprising at least one recess, in which said stone is positioned, said recess being arranged to form, between the substrate and said stone, a peripheral free space at least in the vicinity of the girdle and of the zones (4a, 6a) of the crown and of the pavilion contiguous to the girdle, said peripheral free space comprising a bottom having a conductive surface, b) depositing, by electroplating in said peripheral free space, a metal layer at least in the vicinity of the girdle and of the zones (4a, 6a) of the crown and of the pavilion contiguous to the girdle, so as to confine said girdle in said metal layer to form said setting support; c) releasing said stone and its setting support from the substrate, the method being characterized in the that the substrate and its recess are produced according to the following steps: d) providing a substrate having a conductive surface layer and producing at least one through-hole in said substrate, e) covering the substrate with a photosensitive resin layer and forming, by photolithography in the photosensitive resin, a cavity, the dimensions of which, in the plane of the substrate, are greater than the dimensions of the girdle of the stone, so that the cavity comprises a central opening corresponding to the through-hole and a peripheral zone comprising resin side walls and a bottom occupied by the conductive layer of the substrate around the through-hole, the dimensions of the cavity and of the through-hole forming said recess being selected so that the pavilion of the stone is partially housed in the through-hole, so as to rest on the periphery of the central opening of the cavity, the remainder of the pavilion above the through-hole defining the zone of the pavilion contiguous to the girdle, and so that the remainder of the stone between said zone of the pavilion contiguous to the girdle and at least up to the level of the zone of the crown contiguous to the girdle is housed in the cavity, so as to form, between the stone and the walls (26, 14) of the cavity, said peripheral free space. a) providing a substrate comprising at least one recess, in which said stone is positioned, said recess being arranged to form, between the substrate and said stone, a peripheral free space at least in the vicinity of the girdle and of the zones (4a, 6a) of the crown and of the pavilion contiguous to the girdle, said peripheral free space comprising a bottom having a conductive surface, b) depositing, by electroplating in said peripheral free space, a metal layer at least in the vicinity of the girdle and of the zones (4a, 6a) of the crown and of the pavilion contiguous to the girdle, so as to confine said girdle in said metal layer to form said setting support; c) releasing said stone and its setting support from the substrate, d) providing a substrate having a conductive surface layer and producing at least one through-hole in said substrate, e) covering the substrate with a photosensitive resin layer and forming, by photolithography in the photosensitive resin, a cavity, the dimensions of which, in the plane of the substrate, are greater than the dimensions of the girdle of the stone, so that the cavity comprises a central opening corresponding to the through-hole and a peripheral zone comprising resin side walls and a bottom occupied by the conductive layer of the substrate around the through-hole,