Abstract: A method for manufacturing an external component of a watch, of a fashion item or of a jewellery item, including depositing an inner layer on all or part of the surface of an inner face of a substrate made of a transparent material, localised ablation of the inner layer, so as to conserve a part of the inner layer on a first portion of the inner face f the substrate, the ablation being performed so as to form at least one pocket opening onto a second portion of the inner face of the substrate and so as to structure the second portion of the inner fa of the substrate, treating the surface of the inner layer and of the second portion of the inner face of the substrate.

Abstract: A method for manufacturing an external component of a watch, of a fashion item or of a jewellery item, wherein the external component includes depositing an opaque base layer on all or part of the surface of an inner face of a substrate made of a transparent material, localised ablation of the base layer by laser machining, so as to form at least one pocket the bottom of which has a diffraction grating.

Abstract: An external part component (10) of a watch, of a fashion item or of a jewellery item, including a substrate (11) made of a transparent material, the substrate (11) including an upper face (110) opposite to a lower face (111), the external part component (10) including a base layer (12) deposited over a first portion (1101) of the upper face (110) and at least one secondary layer (13) deposited over the base layer (12) and over a second portion (1102) of the upper face (110), the first and second portions (1101, 1102) of the upper face (110) having different surface conditions.