The invention relates to a cemented carbide composition producing method for precious metal, which includes a titanium nitride component contained therein and shows excellent workability, corrosion resistance, reduction in weight and other desirable mechanical properties, as well as the low amount of nickel used as a metallic binder and an aluminum oxide coating helps to suppress potential negative skin reactions.

A decorative article (100) having an observed colour effect that is changeable depending on observer (200) viewing angle, the article comprising: a decorative element (110) comprising a front side (114) facing a forward direction and a back side (112) opposite the front side facing a rearward direction, wherein the back side comprises a back surface (113) having a first region (122) and a second region (124) surrounding the first region; a first coating (132) arranged on the first region of the back surface, the first coating causing a first colour effect (102); and a second coating (134) arranged on the second region of the back surface, the second coating causing a second colour effect (104) that differs from the first colour effect.

Provided is a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating. Also provided is a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating.

A device comprising: a substrate; a first coating deposited on the substrate; an intermediate coating deposited on the first coating, wherein the first coating is interposed between the substrate and the intermediate coating; and a second coating deposited on the intermediate coating, wherein the intermediate coating is interposed between the first coating and the second coating, and the second coating is outermost and black. The substrate, the first coating, the intermediate coating and the second coating define at least one of a jewelry item and a component of a jewelry item.

In an under component having a proximal end and a distal end, the under component comprising a cylindrical portion extending from the proximal end to the distal end; wherein the proximal end includes a rim that extends laterally from the cylindrical portion and that is flush with the proximal end; the rim extending from the cylindrical portion, wherein the rim includes a proximal edge and a distal edge. An over component having a proximal end and a distal end and a rim having a proximal edge and a distal edge, wherein the distal end of the under component extending to a position flush with a proximal edge of the rim of the over component, wherein the distal end of the over component extending to a position flush with a distal edge of the rim of the under component. A central component, wherein the central component is coupled to the over component, and the over component is coupled to the under component

Provided is a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating. Also provided is a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating. A method for making a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating is additionally provided. Further provided is a method for making a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating.

An anchoring element of a tracking device comprising an electronic tag with a unique identification, an embedding method, and a tracking method of a metal precious object provided with such tracking devices are disclosed. The method comprises the steps of embedding said electronic tag with a unique identification in a ceramic case, embedding said ceramic case in an anchoring element in the shape of a metal frame with open faces, joining said anchoring element to a portion of said metal precious object by laser micro welding, wherein said step of embedding said ceramic case provides to defining at least a recess for each side of said metal frame, locating said case inside the perimeter of said metal frame through said through-slit and blocking it there by means of local melting of material of the same nature of said metal frame so as to obstruct an opening of said through-slit.

A device comprising: a substrate; a first coating deposited on the substrate; an intermediate coating deposited on the first coating, wherein the first coating is interposed between the substrate and the intermediate coating; and a second coating deposited on the intermediate coating, wherein the intermediate coating is interposed between the first coating and the second coating, and the second coating is outermost and black. The substrate, the first coating, the intermediate coating and the second coating define at least one of a jewelry item and a component of a jewelry item.

A layer of lanthanum boride of stoichiometry LaB.sub.x where x is between 9 and 12 is deposited on substrate, for example a stainless steel watch dial, and subsequently treated with a laser, such that the portion(s) of the layer treated with the laser change colour according to the laser power. This produces multicoloured surfaces having high resistance to corrosion and abrasion. The layer of LaB.sub.x is deposited by PVD and by cathode sputtering, using a LaB.sub.6 target of purple-violet colour, such that the colour of the deposited layer differs from the colour of the target. The laser treatment at specific powers changes the stoichiometry of the layer in the treatment portions, such that the colour of these portions changes according to the stoichiometry obtained. At higher powers, the laser will remove the layer of LaB.sub.x. Thus the colour of the treated portions is determined by the material of the substrate.

A method for depositing a coating on a substrate (100), including a step of depositing a thin intermetallic layer (110) on the substrate (100), so as to obtain, at the end of this step, an external part (10) having a predetermined final colour.