This bead is mouthblown authentic Murano Glass. This is our cipolla (onion shape) which is about 20mm aroud an about 15mm through the hole. No two are ever exactly alike due to the handwork. Multi colors of opaque canes are blown and twisted in these beautiful Carnevale Colors. We recommend using a beadcap with this bead to secure the headpin as well as cover the edges of the glass. This is not a defect just how blown beads come out. The holes in the bead vary from about 1.5 to 2.5mm. The color is a transparent blue Venetian Glass. They make great earrings, large but still light weight.