Buy the GemDUO™ 8mm 2-Hole Czech Glass Diamond Beads at Michaels. The GemDUO Czech glass diamond beads have unique 2-hole openings for stringing the beads together horizontally in a row or stringing through one side to create a dynamic vertical look. These beads are a great material for making bracelets, necklaces, specialty keychains or phone charms and more creative beaded pieces.