Black Spinel 3mm Natural Round - 15-16 Inch Strawberry Quartz Pietersite is composed of Tiger

Pietersite is composed of Tiger Eye

Unsealed granite may discolor when exposed to oil

and therefore contains unsealed granite

Each strand is unique

Black Spinel 3mm Natural Round - 15-16 Inch Strawberry Quartz Pietersite is composed of TigerSpinel 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.