This handmade, rainbow quartz necklace is unique and stunning! I made this black necklace using black colored rainbow quartz, stick beads. Rainbow quartz is a dyed and treated quartz with a gorgeous sheen to it. These beads are black in color but the glaze on top shows subtle flashes of various colors. The beads are attached to sterling silver chain and finished with a lobster clasp. The longest bead measures just over 5/8 in. Chain length: 18 in.; beads measure an additional 1 in. across See the last photo for scale.