These are free form faceted Mexican Fire Opal nugget beads. The average size of these unique beauties is 12mm. No two beads, or strands are alike. These natural stones have been gently faceted to expose pockets of translucent "fire" that give these opals their name. Fire Opals are said to rid the wearer of the negativity in their aura and in their environment. These stones will give you physical, emotional, mental, and spiritual healing. These have been strung with a knot in between each bead to avoid any chipping. Very limited, get these while you can.