This bead measures 7mm. This is a wonderful color and shape. Rare one, indeed. This bead has a beautiful blue color and the shape is a dome. They are from the early 1900's. What a find for the collector or crafter alike Glass nailhead beads were used in the days of the flapper to embellish garments before sequins were developed. You will receive 24 antique glass nailhead beads per lot.