For looking instantly put-together. Crafted in 18k gold vermeil with a hinge for easy on and off. Small: Height 4.5cm, opening width 50-65mm, inner diameter 5.7cm, width, 1.2cm Medium: Height 4.8cm, opening width 55-70mm, inner diameter 6cm, width, 1.2cm Large: Height 5.1cm, opening width 60-75mm, inner diameter 6.3cm, width, 1.2cm