A man-made material usually facetted so it will be similar in appearance to a diamond.
The most successful simulated diamond. Cubic zirconia (or cubic zirconium) is an inexpensive, lab-produced gemstone that resembles a diamond. Cubic zirconia was developed in 1977. Properties such as refraction, hardness and specific gravity are remarkably similar to diamonds and cubic zirconia are very hard to distinguish from diamonds. Often a jewelers loupe will be needed to see the difference.
A synthetic gemstone used in jewelry as an imitation diamond. Cut with the same brilliance, weighing 80% heavier, does not have the strength properties of a diamond.