Natural Apple Green Chrysoprase Faceted Large Size Beads Strand The length of strand is 7 Inches and Size 9mm 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