Venetian Beads: square silver or white gold foil Buttons, approx. 20mm, Pure silver or white gold foil (99.99%) encased in glass, dark topaz. Please note these are square buttons, not beads, and have no holes. The buttons need to be affixed with glue to a glue-on button shank with a drop of crazy glue. Matted beads cannot be returned. High quality Venetian beads handmade from Murano glass.