A platinum alloy consisting, by weight, of the following elements: 95.00 to 96.00% of Pt, 1.00 to 4.95% of Ru, 0.05 to 2.00% of Ge, 0 to 2.00% of Au, any impurities with a total content 0.50%.

The present invention relates to a watch protective case with a knob, including a soli rubber case body covering the outside of a watch in a cooperative manner and a hard rubber cover connected to the soft rubber case body in a cooperative manner on an upper end of the watch. A first soft rubber watchband and a second soft rubber watchband are respectively provided at two ends of the soft rubber case body, an adjustment hole is opened in a position on the soft rubber case body that corresponds to a watch button, and a knob adjustment component connected to the watch button in a cooperative and adhesive manner is provided within the adjustment hole. In addition, the adjustment hole is blocked by the knob adjustment component, which can effectively provide dust-proof and aesthetic effects.

The present invention concerns a method for obtaining a finished or semi-finished zirconia-based article, the surface of the article having a metallic external appearance and non-zero surface electrical conductivity, wherein the method includes the steps of: taking at least one zirconia article, pre-shaped in its finished or semi-finished form; placing said article in a chamber in which a hydrogen and carbon/nitrogen gas mixture is heated; heating said article and the gas mixture using at least one resistive element traversed by an electric current to obtain dissociation of the hydrogen and carbon/nitrogen based gas molecules and an increase in the temperature of said article; keeping said article in the reactive atmosphere thus created to obtain diffusion of the carbon/nitrogen atoms in the external surface of said article.

A hold-down member including a plate member which is arranged on a first member having an electronic component and supports the first member, and a resin sheet which is adhered to the plate member, pressed by a second member that is arranged to be rotatable with respect to the first member, and slides on the second member.

A hold-down member including a plate member which is arranged on a first member having an electronic component and supports the first member, and a resin sheet which is adhered to the plate member, pressed by a second member that is arranged to be rotatable with respect to the first member, and slides on the second member.

A component of external parts for a timepiece, the component including a first silicon-based part and a second metal-based part, where one surface of the first part is welded using laser-type electromagnetic radiation onto a surface of the second part in order to secure the parts to each other. A method for fabrication of a component of external parts for a timepiece, by forming a first silicon-based part and a second metal-based part, mounting a surface of the first part on a surface of the second part, and welding, using laser-type electromagnetic radiation, the surface of the first part mounted on the surface of the second part, in order to secure the parts to each other.

A component of external parts for a timepiece, the component including a first silicon-based part and a second metal-based part, where one surface of the first part is welded using laser-type electromagnetic radiation onto a surface of the second part in order to secure the parts to each other. A method for fabrication of a component of external parts for a timepiece, by forming a first silicon-based part and a second metal-based part, mounting a surface of the first part on a surface of the second part, and welding, using laser-type electromagnetic radiation, the surface of the first part mounted on the surface of the second part, in order to secure the parts to each other.

A horology component (1) for a timepiece, including a first portion (10) and a second portion (20), the first portion (10) comprising one part that is at least partially transparent and at least partially superposed on top of the second portion (20), this second portion (20) taking the form of a massive portion comprising a material capable of emitting at least one emission light wave if excited by at least one excitation light wave, and the at least partially transparent part of the first portion allowing an emission light wave emitted by the second portion (20) to be transmitted at least partially toward the outside of the horology component so that the horology component exhibits at least a first appearance by day and at least one different second appearance by night where the first portion (10) is backlit by an emission light wave emitted by the second portion (20).

A timepiece component includes a base member, a first layer provided at the base member, and a second layer provided at the first layer. The second layer has lower hardness than the first layer.

Provided is a timepiece including, in addition to a crystal, the following external elements: a back (2), a middle part (1), a dial (3), and two bracelet strands (30), at least one of these external elements includes a body formed of a first portion made of a first opaque material and of a second portion made of a second partially transparent or translucent material. The first material being integral with the second material and the timepiece also includes at least one light source (10) producing light which passes through the second portion made of a partially transparent or translucent ceramic material comprising zirconia.