AAA Grade CZ:
AAA Grade CZ is a manmade stone, in which its refractive index, dispersion and hardness is extremely close to those of a natural diamond. It also creates more flashes of color, giving it a fiery and brilliant appearance.
Spinel is the magnesium aluminum member of the larger spinel group of minerals. Its hardness is 8, its specific gravity is 3.5–4.1, and it is transparent to opaque with a vitreous to dull luster. It may be colorless, but is usually various shades of red, blue, green, yellow, brown, or black.