Murano glass bead: 20mm square (not quite 1 inch) made with transparent colors over white gold foil. Great size little square 20 X 20 X 8mm with a 1mm hole. Available also in 14mm square and 11-12mm square. White gold is an alloy of actual gold and at least one white metal, usually nickel, manganese or palladium. White gold renders a more muted color than either sterling silver or yellow gold. In this bead it is used with Grigio Murano Glass which is a Gray Glass.