Timepiece comprising an external element provided with a zirconia portion

A timepiece including, in addition to a crystal, a middle part and the following elements:

• a back, a dial, and two bracelet strands, the middle part and at least one of these elements each comprising a body formed of at least one first portion made of a first opaque material devoid of zirconia and of at least one second portion made of a partially transparent or translucent ceramic material comprising zirconia doped with alumina pigments, said first material being integral with said second material and the timepiece further including at least one light source producing light which passes through said at least one second portion,
• wherein said at least one second portion of each body to be illuminated includes at least one inscription intended to be illuminated by the light coming from the light source, and the at least one inscription is made in said at least one second zirconia portion via a method selected from the group consisting of:
• selective carburisation and/or nitriding of the surface of the zirconia;
• a variation in the thickness of the zirconia by mechanical or laser engraving;
• a variation in the density of the zirconia;
• an opaque or semi-transparent impression on the surface of the zirconia;
• a structured PVD physical vapour deposition on the surface of the zirconia or inside the zirconia portion;
• and a combination of two or more of these methods.