... Material:Cubic Zirconia(aka CZ), Corundum, Ruby, Sapphire, Spinel, Glass, K9Shape:Round, marquise, octagon, BAG, pear, oval, heart, ... amethyst, blue, brown, green, olive, peridot, yellow, champagne, coffee, aquamarine, tanzanite, lavender.More colors and more accurate ... economically important competitor for diamonds since 1976. Cubic zirconia is crystallographically isometric, an important attribute of ...