Black Spinel 6mm Round - 15-16 Inch Color_Pink this stone

this stone

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

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

there may not be a beautiful blue-and-brown combination than that of Terra Agate

Historically

Black Spinel 6mm Round - 15-16 Inch Color_Pink this stoneSpinel 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.