Pearlescent pigments with a platelet-shaped non-metal substrate, the pearlescent pigments comprising at least one metal oxide, metal hydroxide and/or metal oxide hydrate layer, characterised in that the surface of the pearlescent pigments comprises bonded polysiloxane of formula: in which R 1 stands for a saturated or unsaturated, linear or branched alkyl radical having 1 to 30 carbon atoms and/or an aryl radical, alkylaryl radical or arylalkyl radical having 6 to 30 carbon atoms; R 2, R 3, R 4 and R 5, independently of one another, stand for saturated or unsaturated, linear or branched alkyl radicals having 1 to 6 carbon atoms and/or aryl radicals, alkylaryl radicals and/or arylalkyl radicals having 6 to 12 carbon atoms; x = 1 to 200; y = 2 to 30; A stands for (CH 2) n, O, S, (OCH 2 CH 2) m or C 6 R 6 4, where n = 0 or 1 and m = 0 to 30 and R 6 stands for H and/or alkyl having 1 to 6 carbon atoms; B stands for (CH 2) z or (OCH 2 CH 2) w where z = 0 to 30 and w = 0 to 30; and R 7 and R 8, independently of one another, stand for O, OH or a saturated or unsaturated, linear or branched alkyl radical having 1 to 6 carbon atoms and/or an aryl radical, alkylaryl radical or arylalkyl radical having 6 to 9 carbon atoms where X stands for O or OH and R 7, R 8 and/or X is bonded to the surface of the pearlescent pigments, and the at least one metal oxide, metal hydroxide and/or metal oxide hydrate coating comprises (a) a high refractive index layer or at least one alternating high and low refractive index layer sequence and (b) a protective layer, and the protective layer comprises or consists of metal oxides, metal hydroxides and/or metal oxide hydrates of silicon, cerium, chromium or mixtures thereof. R 1 stands for a saturated or unsaturated, linear or branched alkyl radical having 1 to 30 carbon atoms and/or an aryl radical, alkylaryl radical or arylalkyl radical having 6 to 30 carbon atoms; R 2, R 3, R 4 and R 5, independently of one another, stand for saturated or unsaturated, linear or branched alkyl radicals having 1 to 6 carbon atoms and/or aryl radicals, alkylaryl radicals and/or arylalkyl radicals having 6 to 12 carbon atoms; x = 1 to 200; y = 2 to 30; A stands for (CH 2) n, O, S, (OCH 2 CH 2) m or C 6 R 6 4, where n = 0 or 1 and m = 0 to 30 and R 6 stands for H and/or alkyl having 1 to 6 carbon atoms; B stands for (CH 2) z or (OCH 2 CH 2) w where z = 0 to 30 and w = 0 to 30; and R 7 and R 8, independently of one another, stand for O, OH or a saturated or unsaturated, linear or branched alkyl radical having 1 to 6 carbon atoms and/or an aryl radical, alkylaryl radical or arylalkyl radical having 6 to 9 carbon atoms where X stands for O or OH and R 7, R 8 and/or X is bonded to the surface of the pearlescent pigments, and the at least one metal oxide, metal hydroxide and/or metal oxide hydrate coating comprises (a) a high refractive index layer or at least one alternating high and low refractive index layer sequence and (b) a protective layer, and the protective layer comprises or consists of metal oxides, metal hydroxides and/or metal oxide hydrates of silicon, cerium, chromium or mixtures thereof. (a) a high refractive index layer or at least one alternating high and low refractive index layer sequence and (b) a protective layer,