Artificially created gemstones, with the same appearance, physical and chemical properties. For example: a cubic zirconia.

A material that resembles another in appearance. The optical, physical and chemical properties are different. The latest diamond simulant is synthetic Moissanite.

A human-created gem having the same look, but not the same physical properties, as its natural counterpart. Cubic zirconia has a diamond like appearance, but none of a diamond's properties.

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.