Black Spinel 8mm Round - 15-16 Inch Morganite It is best known for

It is best known for its characteristic deep blue to violet-blue color

gray and white

Lava is rock from the molten center of the earth

and the material has not been treated with dye

It can even exhibit various colors within the same specimen

Black Spinel 8mm Round - 15-16 Inch Morganite It is best known forSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.