Product Details + Material: gold-plated on sterling silver, moonstoneAvailable in: Gold Size guideline: size 5 (circumference 49mm-51mm, diameter 15.70mm-16.10mm), 6 (52mm-53mm, 16.51mm-16.92mm), 7 (55mm-56mm, 17.35mm-17.75mm), 8 (18.19mm-18.53mm)