A method for making a composite item which has a cosmetic product, or layer thereof, and a decorative element. The decorative element is inserted within a seat formed in the cosmetic product and the composite item is inserted within a container for cosmetics. The method includes the steps of: providing at least one through hole within the cosmetic product, or layer thereof, such that the through hole has a size which allows the decorative element to be at least partially inserted therein; fastening or resting the decorative element onto a support which has a base portion that geometrically interferes with at least one inlet opening of the through hole, preventing the base portion from entering the through hole; and arranging, at least partially, the decorative element within the through hole, through the inlet opening with the base portion being engaged with the inlet opening of the through hole.