Object of the present invention is a cementitious product for ornamental, non- structural use, in particular for applications with aesthetic and decorative purposes in integrated architecture. It is produced by mould casting of a fluid composition comprising: I. a hydraulic binder II. one or more aggregates III. an anti-shrinkage agent IV. a superfluidifying agent V. water, wherein at least one insert in hydrophobic material previously fixed to the inside of the mould remains incorporated as visible marquetry in the product after extraction from the mould.