A demonstrator (1) of qualities of a spectacle lens material, includes a hollow base (10) which is open through an observation window (13), and a lens (20) which closes the observation window and includes at least one part (21) made of the spectacle lens material. The demonstrator includes at least two separate demonstration elements selected from the following list: an electrostatic element (50) that can move under the action of an electrostatic attraction; an ultraviolet mark (43) which allows the ultraviolet light to be viewed with the naked eye; and an abrasive element (30) suitable for scratching the demonstrator lens (20).