Check out the “Saphikon” company. They make lab grown high-tech
sapphire in a great variety of shapes. (and for that matter in an
intriguing growth process in which the molten sapphire is "wicked"
into a sort of absorbent substrate which means it can be grown in
just about any shape, plates, rods, what-have you.)
I was given this web page by a person from Saphikon.
Hope that helps,