This transparent element (1) made in layers has two smooth external main surfaces (2A, 4A) and comprises: - two external layers (2, 4) each of which forms one of the two external main surfaces (2A, 4A) of the element (1) and which are made of dielectric materials having substantially the same refractive index (n2, n4), and - a central layer (3) interposed between the two external layers, this central layer (3) being formed either of a single layer which is a dielectric layer with a different refractive index from that of the external layers or a metallic layer, or of a stack of layers comprising at least one dielectric layer with a refractive index different from that of the external layers or a metallic layer. Each surface (S0, S1) of contact between two adjacent layers of the element (1), one of which layers is dielectric and the other metallic, or both of which are dielectric layers with different refractive indexes, is textured and parallel to the other textured contact surfaces.
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