... :Cubic Zirconia(aka CZ), Corundum, Ruby, Sapphire, Spinel, Glass, K9Shape:Round, marquise, octagon, BAG, pear, oval, heart, square, ... and close visual likeness to diamond, synthetic cubic zirconia has remained the most gemologically and economically important ... competitor for diamonds since 1976. Cubic zirconia is crystallographically isometric, an important attribute of ...