Navy Blue Opaque Czech Glass Round Beads 10mm Czech glass round beads available in opaque, translucent, opal, swirl and metallic finishes. 10mm Czech glass rounds are rich and dramatic for bold jewelry pieces. Ideal accent or focal beads on necklaces and bracelets and as the main bead on an earring. Beads are packed loose, ready to use. Size and pack specifications: Beads are 10mm in diameter. Approximately 16 beads per pack.