>>11405633High-quality corundum gemstones (ruby, sapphire) are manufactured by dissolving aluminum oxide and appropriate inclusions in flux
Then the flux is gradually lowered in temp over a few months to force the supersaturated aluminum oxide out onto a seed crystal
Just like rock candy
You probably work out a recipe of temp/time, flux, and pressure to manufacture any mineral you like, but the operating cost would be ridiculous and the apparatus would be stupidly expensive to build
You'd need a solid platinum crucible to hold all your shit and that alone would cost more than a house
