As a noun punty is (glassblowing) a metal rod used in the glassblowing process after a glass vessel has been blown to approximate size and the bottom of the piece has been finalized, the rod, which is tipped with a wad of hot glass, is attached to the bottom of the vessel to hold it while the top is finalized it often leaves an irregular or ring-shaped scar on the base when removed called the “pontil mark”.

As an adjective purty is (informal).