Green "opal" gemstone beads have rich earth tones, a polished luster and smooth surface. A type of chalcedony, natural green "opal" has a hardness that works for long-wearing designs. Machine-cut for a consistent size and shape.
Beads>Grade B>Other Opal VarietiesBeadsGrade BOther Opal VarietiesGreensBall12mmNaturalhttp://www.firemountaingems.com/itemdetails/h209556gsH209556GSBead, green "opal" (natural), 12mm round, B grade, Mohs hardness 4-1/2 to 6. Sold per 16-inch strand.//image1.fmgstatic.com/images/p9556gsb.jpg22.8922.89As Low As $11.73 per strand