Oh, easily. All it is is some Crystalised Aluminium (III) Oxide and some Copper/Chrome Oxide traces. Mix Aluminium and Chrome/Copper Dust together (95% Aluminium) Melt in a very hot furnace, Cool in a SingleCrystal form. Done. Sapphires are Aluminium (III) Oxide and Trace Iron, titanium or magnesium.
I think a few pages ago I made a suggestion about how to go about doing this.