Method for the three-dimensional decoration of a substrate to produce an external part

A method for the three-dimensional decoration of a substrate (11) to produce an external part (10), which method comprises the steps of:

• depositing at least one enamel base layer (12) on an external surface (110) of a ceramic substrate (11);
• firing the substrate (11) covered with the base layer (12);
• etching the base layer (12) in a predefined decorative pattern so as to generate one or more blind cavities (120) extending between a bottom formed by the substrate (11) and an opening formed by the base layer (12);
• depositing a decorative layer (13) of ceramic material and/or metallic material on the base layer (12) and the cavities (120) so as to fill said cavities (120) in order to form decorative elements (130), the material of the decorative layer (13) being chosen such that its melting point is below the glass transition temperature of the material constituting the base layer (12);
• surfacing the decorative layer (13) so as to remove all of said layer deposited on the base layer (12);
• and
• tribofinishing the substrate (11), the base layer (12) and the decorative layer (13) to remove the entire base layer (12).