This paper reports parameters germane to growing and controlling the size of perylene nanocrystals, as well as to embedding these nanocrystals in suitable media. The perylene nanocrystals obtained in this study were of the α form and produced J-aggregates having a stacking angle about 40.7°. Investigation of the spectral properties of these nanocrystals revealed a size-dependent blue shift in their absorption spectra, which makes them potentially useful in optics.