Coloration of Ti-doped sapphire grown by the Flame-Fusion Method was examined here in detail. The as-grown sapphire was slightly colored with pink caused by Ti3+. After annealing in the air, the pink color faded away because Ti3+ oxidized to Ti4+. The colorless sapphire was colored anew into brown by ultraviolet (UV) irradiation. This coloration was discussed based on some defects in Al2O3. By UV irradiation, TiAlIV+ changed into TiAlIII× and hole (h+). The hole was trapped in VAl3-, and the resultant color center caused brown coloration. In order to prevent the valence change, co-doping with (Ti-Fe) and (Ti-Mg) was attempted. Then, the brown coloration decreased successfully. © 2013 The Ceramic Society of Japan and the Korean Ceramic Society.