PRECIOSA Rocailles are one of the most used type of glass seed beads in the world. They were originally created in Venice, Italy in the 15th century. These seed beads have been produced in Bohemia since the 18th century. These round-shaped seed beads are manufactured using a unique technology for cutting glass tubes with round or square holes into various sized pieces which are then rounded and polished when hot and subsequently classed by size and shape.