30mm External diameter Average weight 6.1 grams Metal: Silver <-- Split -->Diameter: 28.7mm Width: 3.9mm Width is the largest part unless stated otherwise <-- Slit --> FREE UK Shipping*: 5 - 6 days Royal Mail 24 or Special Delivery. Returns: Faulty items can be returned within 7 days. Click for more information. Hallmarking Guide: Sterling Silver less than 7.78g not stamped but has a 925 mark. More than 7.78g stamped.