This one measures 22mm square. This one is faceted and has two holes. Large and lovely with a hint of blush for a very unique color. It's fabulously faceted. This beauty has two holes and a concave back as illustrated in the image. It could possibly be used as a cabochon in many applications.Glass nailhead beads were used in the days of the flapper to embellish garments before sequins were developed. Check out the spin photography on this one.