Periwinkle Blue Venetian Glass 1920s Flapper Necklace. A rare and beautiful find, this fabulous 1920s flapper necklace is made from links of vibrant periwinkle blue Venetian glass. The rectangular beads have a pattern of black, yellow, orange and red markings that vary throughout the necklace. This 1920s flapper necklace is made up of an unusual shaped rectangular bead linked to a small round bead, a saucer bead and a small round bead. The pattern repeats the entire way around. You could layer this necklace with long or short red, yellow or jet black beads for a more dramatic effect. With a total of 46 inches this necklace is a great accessory for a little black dress, long black tunic or Gatsby style drop waist frock. This necklace is in very good condition.