Black Spinel 5x9-10x18mm Drop - 8 Inch Size_8x10-10x12mm In this strand

In this strand

the other being Diamond

Most turquoise is mined from veins found in the surrounding stone

air bubbles or black carbon deposits

It also serves as the Mohs hardness scale index mineral for a hardness of 8

Black Spinel 5x9-10x18mm Drop - 8 Inch Size_8x10-10x12mm In this strandSpinel 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.