Black Spinel 4x6mm Faceted Rondelle - 15-16 Inch (dyed) including Diamond

including Diamond

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

It forms when Quartz and Feldspar crystallize in radial aggregates within other silica-rich stones

Chrysoprase is a bright apple green

Hematite is black to steel to gray or silver to gray

Black Spinel 4x6mm Faceted Rondelle - 15-16 Inch (dyed) including DiamondSpinel 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.