Each bead varies in size, shape and color no two beads are exactly alike. Because these are natural stone beads, each one has its own character including crackling, inclusions, chips, etc... These beads are all center drilled, with the occasional bead having a slightly off center hole.The beads measure about 10mm long by 14mm wide and the holes measure about .5mm to .8mm. The strands measure about 7.5" inches long. There are approximately 18 beads on a strand.All photos have been taken indoors with daylight, but as always, computer and mobile screens display colors differently.