Black Spinel 6mm Round - 15-16 Inch Color_Pink Emerald and Heliodore -- and

Emerald and Heliodore -- and is often cut to highlight its chatoyant qualities

Dumortierite is an aluminum borosilicate mineral that varies in color from blue

features intricate light brown patterns on dark brown stones

Mexican Laguna Lace Agate is one of the most prized agates in the world

Black Spinel 6mm Round - 15-16 Inch Color_Pink Emerald and Heliodore -- andSpinel 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.