Effect pigments with a platelet-shaped substrate provided on at least one side with at least one coating of semitransparent metal and/or at least one high-index coating having a refractive index ≧2.0. The platelet-shaped substrate includes at least one mixed inorganic/organic phase. Also, a method of producing effect pigments including the following steps: a) combining at least one organic network former, at least one reactive organic component, at least one inorganic network former and/or nanoscale inorganic particles and a liquid phase to form a reaction composition, b) applying the reaction composition to a sheetlike base, c) forming a solidified mixed inorganic/organic phase, d) converting the mixed inorganic/organic phase into platelet-shaped substrates, and e) coating the platelet-shaped substrates with at least one coating of semitransparent metal and/or at least one high-index coating having a refractive index ≧2.0.