These eye studs measure 1/4" in legth. They are made of 14k gold plated brass with surgical steel posts. They are set with Czech crystals. Designed and assembled in our Sonoma California studio. The eye has become so ubiquitous in popular culture. Rooted in mysticism and superstition it is believed to protect the wearer, to represent the eye of divinity, the third eye and of course the eye is believed to be a window to the soul.