4 x 17mm Diafan beads in Sapphire with Copper

This is a pack of 4 Diafan beads in Sapphire with Copper lines. The beads measure about 17x17mm and are 4mm thick. There is a hole diagonally through the bead (from the semi circle design to the opposite corner). They were made in the Czech Republic.The Czech number for this colour is 30080/54319.