In the present study, the characteristic of the ceramic shells for investment casting (IC) made from nano-colloidal silica binder and reinforced with coconut fibres has been studied. The shell characteristics, such as thickness, unfired strength, fired strength and porosity, have been analysed. Both a plane ceramic shell without coconut fibre and with coconut fibre were prepared for the sake of comparison between the two shells. The microstructure of the coconut fibre as well as the shells containing coconut fibres was analysed using scanning electron microscope (SEM). It was found that the coconut fibre-reinforced ceramic shells exhibited 32% more thickness as compared to its counterpart. Its green strength was 2.35 times the ceramic shell without coconut fibre. The fired strength of the coconut fibre-modified ceramic shell was found to be less than the ceramic shell without coconut fibre, which is advantageous for easy knock out operation of the shell to remove the cast parts. The porosity of the ceramic shell reinforced with coconut fibre was found to be 61.6% more than the plain ceramic shell. The adopted method proved effective in reducing the production lead time and cost of manufacturing the IC ceramic shells.