Turquoise 14kt gold nose stud, nose ring. 14kt gold plated 316L surgical steel nose ring with a turquoise stone that measures 4mm including the setting it is in and is 20 gauge. The turquoise nose stud is 6mm before the bend. Turquoise is a natural stone, no two stones are exactly alike. Some have black streaks (or matrix) while others are solid turquoise blue.