Black Spinel 3mm Table Cut Cube A Grade Bead - 15-16 Inch Shape_Tube Through this process

Through this process

most natural topaz is colorless

Unsealed granite may discolor when exposed to oil

Iron gives them blue

with small

Black Spinel 3mm Table Cut Cube A Grade Bead - 15-16 Inch Shape_Tube Through this processSpinel 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.