The Arkenstone is a 10 mm (3/8″) Swarovski Crystal sphere. The ring is cast in solid sterling silver and is available in US sizes 5 to 13, in whole and half sizes. The ring measures approximately 16.4 mm (5/8″) top to bottom, 19.7 mm (3/8″) thick and 3.1 mm (1/8″) wide at the back of the band. The ring weighs approximately 9.9 grams. Weight will vary with size.