Part with 3d decoration and its manufacturing method

A method for manufacturing a part (1) made of an electrically non-conductive material such as ceramic and sapphire, the part (1) comprising at least one relief decoration (2a) comprised of a noble metal or its alloy, the method comprising the steps of:

• providing an ébauche (3) designed with a surface (2);
• depositing a first adhesion layer (4a) and then a second adhesion layer (4b) on the surface (2);
• depositing by electroforming a layer of the noble metal or of its alloy (5) on the second adhesion layer (4b);
• laser cutting the layer of noble metal or of its alloy (5) to outline the relief decoration (2a);
• depositing a protective layer (7) around the relief decoration (2a);
• removing the layer of noble metal or of its alloy (5) from portions (2c) not covered by the protective layer (7) and optionally removing the second adhesion layer (4b) from said portions (2c) if the second adhesion layer (7) is made from the same noble metal or the same noble metal alloy as the layer of noble metal or of its alloy (5);
• removing the protective layer (7);
• and
• removing the first adhesion layer (4a) and optionally the second adhesion layer (4b) if the latter is still present after removing the layer of noble metal or of its alloy (5) on the portions (2c).