Multi Spinel 4mm Faceted Round AA Grade - 15-16 Inch Sunset African Jade is a complex

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

due to variations in iron content

It features:

Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation

red to violet

Multi Spinel 4mm Faceted Round AA Grade - 15-16 Inch Sunset African Jade is a complexSpinel 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.