A real UK silver coin that has been rolled to keep details on both sides. Pre 1920's coins are used as they are 97% silver. Dates vary but you can request Queen Victoria, King George, etc.
Sizes vary so that small coins like sixpences make good pinky rings or smaller sizes for women whilst larger coins make large rings! Shillings are unisex, Florins are larger whilst Half-Crowns are more male sizes. Bands can be thin or really thick 'car tyre' style and can be bright silver or aged.