Also called: Imitation. Any diamond like material, either natural or artificial, which is marketed as look-alike for a natural diamond. i.e. Glass, - zirconium, YAG, GGG, moissanite etc.
A human-created gem having the same look, but not the same physical properties, as its natural counterpart. An excellent example of a simulant is the cubic zirconia, which has a diamond-like appearance yet none of its properties.