In creating this necklace I selected graduated rounded disk chrysocolla beads, 3 mm chrysocolla beads and sterling silver findings including 4 mm round beads and a toggle clasp. The graduated beads vary from about 10 mm in diameter by 7 mm to 22 mm in diameter by 15 mm. The necklace is 22" in length and heavy due to the size of the beads. I assembled the necklace on very strong beading wire and triple crimped the ends. The supplier said the beads were Chrysocolla but they may be dyed Jasper. Either way, they are beautiful Beads.