Sterling silver. 18-karat yellow gold (available in Medium length only). Reversible sterling silver and 18-karat yellow gold. Twisted sterling silver. Choose your clasp: Select from four sizes. Extra-Small, approx. 5mm (available in Sterling Silver & 18-Karat Yellow Gold). Small, approx. 6.5mm (available in Sterling Silver & 18-Karat Yellow Gold). Medium, approx. 7.5mm (available in Sterling Silver & 18-Karat Yellow Gold). Large, approx. 10.5mm (available in Sterling Silver & 18-Karat Yellow ...