CD Bioparticles provides Fluorescent Gold Nanoparticles (AuNPs) labeled with various fluorophores for multimodal imaging by dark-field scattering, fluorescence, as well as electron microscopy. The fluorophore labeled gold nanoparticles exhibit both high absorptions and scattering from gold nanoparticle as well as enhanced fluorescence from the attached fluorophores. Gold nanoparticles significant enhance the fluorescent signal and quantum yield of fluorophores based on the metal-enhanced fluorescence (MEF) effect.