This unique cocktail statement ring features a central natural aventurine cabochon surrounded by sparkling marcasite gemstones green aventurine is thought to be a lucky crystal gem bringing opportunity and good fortune to the wearer once used as a substitute for the shine of a diamond the natural semi precious gemstone marcasite is now celebrated for its lustre and metallic beauty together in this fine fashion 925 sterling silver ring design aventurine and marcasite make a beautiful couple