The present invention relates to a label (1, 1', 1", 1"') for verifying authenticity of items, the label (1, 1', 1", 1''') being configured to be attached to items and comprising a plurality of focusing micro-optical elements (3) and a microparticle layer (5) comprising a plurality of luminescent and/or scattering microparticles (7), wherein the plurality of focusing micro-optical elements (3) and the microparticle layer (5) are arranged so that at least a part of light emitted and/or scattered from the plurality of luminescent and/or scattering microparticles (7) reaches the plurality of focusing micro-optical elements (3).