The sizing on these may vary as a result of the production process, optimally they are about 14mm with a 1mm hole in the center. The dichroic adds such sparkle and depth to the bead which is very difficult for photography. The exact placement and coverage of the dichroic also varies. Dichroic Beads are a great way to upscale your Murano Glass Jewelry. The base color in this one is a pale blue with the sparkle of the dichroic.