This necklace is made up of graduated semi-precious gemstones. The ones that I recognize are aventurine, amethyst, carnelian and agate. I'm not sure what the others are, maybe different types of agate. The largest bead measures 12mm and the smallest 7mm. There is no clasp as the necklace is long enough to slip over the head. In between each bead is a gold-filled spacer. Some of the beads are not completely round and on others the hole is not drilled directly through the center of the bead. Measures 32" in length. No crack or chips.