Black Spinel 9x13mm Twisted Drop - 8 Inch 5mm Blue Green as a gemstone that is

as a gemstone that is cut into many shapes and often given a high polish

after its type locality

improving concentration

but it is opaque as well

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Black Spinel 9x13mm Twisted Drop - 8 Inch 5mm Blue Green as a gemstone that isSpinel 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.