Hydroxyapatite/Fluoroapatite - Zirconia composites were prepared by two different methods using Indian coast corals. In the 'Low Temperature Method' 10 mol. % zirconia is mixed with the coral and a exchange reaction with di-ammonium phosphate is carried out to form apatite at 250°C under pressure. The coralline derived hydroxyapatite/fluoroapatite by the above method is reacted with zirconia at 900°C in the 'High Temperature Method'. The X-ray powder diffraction, Infrared spectroscopy and Thermal analysis were employed to characterise the formation of the composites. In-vitro solubility tests in phosphate buffer solution of pH 7.2, indicated the stability of the composites. The low temperature method of preparation seems to be advantages due to better in-vitro stability and absence of impurity phases.