These Prehnite beads are cut into a fully faceted briolette or "pear" shape. Note from the picture that they have tiny flecks and needle shaped inclusions of black that are common in this gemstone. Sizing in this group is very uniform so all are being sold in the same size category. Each bead will be between 7-8mm in both height and width. Holes are small, but will accommodate 0.3mm stringing material.