Black Spinel 15-20mm Double Drill Puff Hexagon - 8 Inch Stone Type_Carnelian Gem Silica is the rarest

Gem Silica is the rarest and highest form of Chrysocolla

To find out more about the process

Chiastolite is also known as the Cross Stone for the cross matrices of browns

a meteorite builds up heat that is then released into the terrestrial rocks with which it collides

Brazilian Amazonite is an opaque blue-green to light green stone

Black Spinel 15-20mm Double Drill Puff Hexagon - 8 Inch Stone Type_Carnelian Gem Silica is the rarestSpinel 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.