The proposed method for producing synthetic opal involves obtaining a deposit from a suspension of amorphous silica containing spherical silica globules 150 to 450 nm in size, the deposit consisting of at least two layers of amorphous silica. The particles in any given layer are 10 to 15 % larger or smaller than those in an adjacent layer. The deposit is dehydrated by drying and subsequently undergoes pneumolytic roasting. The deposit is then soaked in a silica sol produced by the sol-gel method and heat-treated at a temperature of 400 to 600 DEG C.
