Zircon vs. Zirconia: Avoid the confusion of the difference between zircon and cubic zirconia, because they are different! Zircon is zirconium silicate and Cubic Zirconia is zirconium dioxide. Both can be mistaken for a diamond, as they are used to imitate the precious gem.
A round, diamond-like clear white cubic zirconia stone - a fraction of the price of a real diamond, and no one would be the wiser!