Black Spinel 6mm Round - 15-16 Inch birthstone_sapphire though it is referenced as

though it is referenced as a highly revered stone in much older Inuit tribal legends

It's also known as Angelita and Angelite Quartz

It is found only in a four square mile area in a remote mountain range of Chihuahua

Smoky Quartz

Black Spinel 6mm Round - 15-16 Inch birthstone_sapphire though it is referenced asSpinel 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.