Natural Green Chrysoprase hand cut Faceted Onion Beads Strand Sold per 5 inch strand and Size 5mm to 7mm Approx.Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel. Called the stone of Venus, chrysoprase is the rarest and most valuable rich apple -green gemstone in the chalcedony family