diyBeads is an authorized Preciosa Dealer. PRECIOSA rocailles are the most used type of glass Seed Beads. Created in Venice, Italy in the 15th century. These Czech Glass Seed beads have been produced industrially in Bohemia since the 18th century. Often compared with other well-known Japanese seed beads, for example, the Miyuki Delica brand. You will also come across them throughout the world.