Zirconia is a very inexpensive simulated Diamond and an excellent
alternative. Although mostly seen in its white or colorless
forms, CZ (as it is commonly known) is also available in a wide variety of
colors. Nearly as hard as Ruby and Sapphire, the optical properties are
high and CZ has good brilliance. Despite its near stranglehold on the
simulant Diamond market for the last two decades, it now has more competition
from other man made gemstones such as Moissanite.
Gemstones are now the largest growth sector in the jewelry business