Abstract: Starting with an article of the so-called “gas pipe” type which is formed from two concatenated spiral components (1, 3) and is deformed into a noncircular configuration, the article is cut lengthwise (7) to cut the turns of the two components, which remain connected without relative movements.

Abstract: A decorative chain formed from small hollow balls engaged by connection segments (103) is transformed by subjecting the small balls of the chain to deformations by beating; the chain is then articulated. The main faces (101A) of the deformed small balls (101) can be surface-treated by diamond engraving or satin-finishing or other surface treatments.

Abstract: A body (1) is machined in order to form: an axial cavity (5) for the stone the cavity having an edge (1B) that can be pressed over in order to anchor the stone; a lip (1E) that forms an abutment surface (1F) for resting against the surface of the laminar support (3) around a hole (4) formed in the support; adjacent to the lip (1E), a bearing section (9) that widens out and bears against the edge of the hole (4) in the support; and an elastic projection (11, 11A) that is joined to and extends from the section (9) and that can pass into the hole (4) and then re-expand so as to bear against the edge of the hole.

Abstract: Starting with a helical chain of large links, of the type known as a "transverse figure-of-eight chain" or "transversely assembled figure-of-eight chain" that can be made by machine, after a preliminary twisting operation in which it is reduced to the general form of a strip with rounded edges, that is to say in the so-called "linx" chain configuration, a further deformation is carried out by swaging it in the direction of the greatest dimension of its cross section, in such a way that its cross section is deformed into a generally square figure.

Abstract: A strip (1) is formed by lamination with diffusion, having two longitudinal bands (1A; 1B) of two different metals and two additional thicknesses (1E and 1F) bonded to the metals of said two bands (1A; 1B); the resulting strip is shaped by drawing it into a wire of circular section with a longitudinal slit (13), with said two longitudinal bands (1A, 1B) of different metals on the outside; said wire is wound into a helix, with the slit (13) on the inside of the turns, and the helix is then cut to form pieces (111) in the form of twisted open rings; said twisted pieces are formed into a chain of soldered and twisted links with the orientation of each of said two bands of each link on the same side of the chain, so that it shows two colors.

Abstract: The apparatus is used for forming a diamond shape on ornamental chains (C) of variable width, and comprises a support having a slide guide flange (1A) with an intermediate gap (3) for the space required for the diamond-shaping tool (5), a shoe for lateral pressure against the support and, to serve as guide means acting along the edge (B1) of the chain opposite the edge (B) to be given a diamond shape, two pressers (14) acting independently on said edge (B1) adjacently to said gap (3).

Abstract: A closure for necklace, bracelet or the like comprising a spring-ring with a gapped annular or similar form and a sliding catch therein actuated by a spring contained therein, the closure having a lug with two approximately parallel generally flat laminar portions extending substantially parallel to each other and connected to the spring ring to which they are soldered or welded, the lug having means for connection to one end of a necklace, bracelet or the like.