The Al203:Ti crystals are synthesized when the Ti irons are added into the reaction medium and orange color sapphire crystals are obtained when the Mn irons were added.

• 在前驱物中掺入适量的Ti化合物时，合成出Al_2O_3:Ti宝石晶体； 前驱物中掺入适量的Mn化合物时，合成出橙色蓝宝石晶体。