BFP07 Wholesale freshwater blister pearl beads online. The size is about 8*13mm. These pearls have irregular shapes and are side drilled. They are often used for making Christmas jewelry and unique designed jewelry. The list price is for only one strand.Blister Pearls are created when the pearl bead nucleus is attached to the surface of the mussel. The pearls are then cut from the mussel with a large slice of the shell still attached.