Black Tourmaline Faceted Rondelles measure approximately 6mm diameter average in size, the gemstones are opaque with a brilliant highly reflective quality, the beads are a symmetrical rondelle shape with fairly consistent width, these Black Tourmaline are a natural, true black color showing slight external characteristics, and these sparkling gemstone provide an great quality strand of faceted black tourmaline in a slightly larger than average size of rondelle.