I created this unique necklace using hexagon shaped Dumortierite beads and sterling silver findings including Bali Spacer beads, 4 mm round beads and a toggle clasp. Although much less expensive Dumortierite resembles dark lapis. The necklace is 18 1/2" in length and the Dumortierite beads are mostly 5 to 7 mm in length. I added a Bali spacer bead between each and every Dumortierite bead!