CAMAIEU, or CAMAYEU, a word used to express a peculiar sort of onyx; also a stone, on which are found various figures, and representations of landscapes, or the like, formed by a kind of lucus naturæ, so as to exhibit pictures without painting. It is of these cameaux Pliny is to be understood as speaking when he says of the manifold pictures of gems, and the particoloured spots of precious stones: Gemmarum pictura tam multiplex lapidumque tam discoloris macula.