Semi-polished yellow gold-colored sterling silver. Engraved details. WOMEN'S SIZING:,XS: Size 1 internal circumference = 40-55mm,S: Size 2 internal circumference = 43-58mm,M: Size 3 internal circumference = 46-60mm,L: Size 4 internal circumference = 49-64mm,XL: Size 5 internal circumference = 52-67mm