This 10mm round features transparent glass encasing .925 sterling silver foil. Authentic Murano Glass Bead, great for accents, wherever you need a small economical bead. The sterling silver foil gives a brightness to the color. It is a round approximately 10mm in diameter with a 1mm hole. They are handmade and as such will vary in size. This is in Amethyst medium and is a shade of purple.