A method of fabricating a colloidal photonic crystal self-assembled onto an optical fiber’s cladding is proposed. The coating of a single-mode fiber was removed, the cladding was exposed, and colloidal photonic crystal was overcladding through isothermal heating evaporation-induced self-assembly. The photonic crystal cylindrical annulus is characterized by optical and scanning electron microscopy. The optical characterization was analyzed and carried out followed by detailed discussion. The measurement results show a bandgap by optical transmission spectroscopy. The results also demonstrate a practical means of enveloping macro- or microcurved surfaces with three-dimensional photonic crystals.