Green Moonstone (top bead in photo) is rare and is considered a gemstone. It's often referred to as "The Stone of the Goddess" and is said to balance energies and connect to feminine earth energies. This stone symbolizes mystery, love and compassion.
Green Moonstone is chatoyant and often has "Fans" that are easier to see in the larger beads, like M14 and M20. This bead  is best for necklaces since it measures 20mm in size.