The stud you never take off. These wire-wrapped Herkimer diamond studs have that rare quality of feeling both minimal and special — a naturally faceted crystal that catches the light like a diamond, set simply in gold-filled wire and made to wear every day. Small enough to wear alone, interesting enough to stack. Herkimer Diamond Quarta. 14K gold fill wire. 14K gold fill ear back. Width: .25 inches.