Multi Spinel 2.5mm Table Cut Cube AA Grade - 15-16 Inch Calming It is an aluminum borosilicate

It is an aluminum borosilicate mixed with iron

Sometimes called the "Black Prince's Ruby" for its role in the English crown

Astrophyllite gets its name from the Greek words astron meaning "star" and phyllon meaning "leaf"

West African Jade is a complex Calcium Aluminum Silicate and is a Nephrite Jade

Multi Spinel 2.5mm Table Cut Cube AA Grade - 15-16 Inch Calming It is an aluminum borosilicateSpinel 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.