Before the addition of Polished Basalt, many stone variants that can be obtained by crafting or stonecutting are called Polished or Cut:
Andesites can be crafted or stonecutted into Polished Andesites.
Diorites can be crafted or stonecutted into Polished Diorites.
Granites can be crafted or stonecutted into Polished Granites.
Sandstones can be crafted or stonecutted into Cut Sandstones.
While variants that can be obtained by smelting are called Smooth:
Sandstones can be smelted into Smooth Sandstones.
However, the Polished Basalt, which is obtained from smelting, doesn't follow the rules above. Might considering renaming it to make its name consistent with other stone variants, or changing it recipe to crafting and/or stonecutting?