It was found for the first time that single crystals of MgTiO3 solidsolutions showed chatoyancy and they could be used as a new modified cat's eye gem stone. The crystal growth experiment was made by the traveling solvent float zone method using a halogen lamp image furnace. The grown crystals tended to grow mostly along the [1010]-axis. As grown boules were darkend. but became transparent and colourless after annealing at 1300°C for 24 hours in oxygen atmosphere and showed distinct chatoyancy along the (0001)-plane.
