I don't think it is alabastro. From what I've read, alabastro can crack when cased because of compatibility problems. What this means, I don't know. Casing it would also take away the nice opaque surface people are seeking with alabastro. I can't help with who made the vase, but it is cased, it most likely is not alabastro. (I am not a glass chemistry expert, so you are welcome to question anything I wrote.)